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Volume 25, 24 Issues, 2021
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ISSN (Print): 1385-2728
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Special Issue Submission
Recent Advances on Functional Group Interconversion
Guest Editor(s): Teresa M. V. D. Pinho e Melo, Ana L. Cardoso
Submit Abstract via EmailDownload Description
Protein Kinases and Their Inhibitors
Current Enzyme Inhibition, Volume 13, Number 2
Guest Editor(s): Satya P. Gupta
"Current Enzyme Inhibition is an important review journal that describes recent developments in enzyme inhibition studies and is of great value to pharmaceutical and medicinal chemists."
Richard B. Silverman
Northwestern Univ., USA
"We are very satisfied by the services of Bentham Science Publishers; due to which we publish the majority of our papers with you.
(Faculty of Pharmacy, “Victor Babes” University of Medicine and Pharmacy, Timisoara, Romania)
5 Abstract Ahead of Print are available electronically
12 Articles Ahead of Print are available electronically
Cancer has killed more people in the world than all major wars taken together. A number of interventions and
disease management approaches have been undertaken. These approaches include chemotherapy, radiation
therapy, immunotherapy, hormone therapy, gene therapy or targeted therapy . In some cases, surgery in
addition to any of the above approaches is also recommended. In a fight against cancer through medication,
organic and medicinal chemists have come out with a number of drugs, majority of which are based on
heterocyclic compounds. The success of these efforts can be gauged from the fact that numerous drugs based on
heterocyclic motifs have either reached the market or are in advanced stages of clinical trials . The gargantuan
library of heterocyclic compounds is there to explore and experiment and more often than not, it has given
unparalleled results with each passing year. The most prominent heterocyclic moieties with anticancer compounds
include quinazoline derivatives, indole derivatives, thiazole and 4-thiazolidinone containing heterocyclic
compounds, flavonoids, polyphenolic compounds, azoles and benzimidazoles to name a few. The azole based compounds deliberated as
anticancer drugs effectively bind to the target proteins and enzymes via non-covalent interactions . Heterocyclic anticancer agents are
known to act by targeting various enzymes or receptors, including (HDACs), sirtuins, PIM kinases, DNA topoisomerases, and σ receptors .
They are effective against a number of different types of carcinomas with encouraging results. Some of such heterocycles approved recently
by FDA for different types of gliomas include alectinib, apalutamide, etoposide and pexidartinib. The structural similarity of amino
derivatives of benzimidazole with purines makes it a fascinating nucleus for the development of anticancer agents. There is a direct
relationship between anticancer activity and the chemical functionalities around benzimidazole nucleus . Quinazolines act as kinase
inhibitor for EGFR mutation and exhibit antiproliferative activity . Several quinazoline derivatives have been approved by FDA for clinical
use as anticancer drugs. These include gefitinib, erlotinib, lapatinib, afatinib, and vandetanib. These agents act through different mechanisms
such as inhibition of tyrosine kinase, inhibition of human epidermal growth factor receptor-2 (HER2/neu) and epidermal growth factor
receptor (EGFR) pathways. . The synthesis and isolation of numerous novel anticancer agents of natural origin have also gained
momentum over the past years. Indole based alkaloids like vincristine, vinblastine, vinflunine, and vinorelbine derived from the plant
Catharanthus roseus are popular anticancer drugs. They owe their anticancer activity to their ability to dissolve the mitotic spindles and cell
division resulting from the microtubule disruption . The polymerization of tubulin is the main target in most of the indole-based
compounds . Similarly, flavonoids are polyphenolic compounds derived from fruits and vegetables and also present in plant-derived
beverages like wine, green tea, and cocoa-based products. A number of flavonoids that have been reported to exhibit potent anticancer
properties in animal studies have been further screened for their safety and efficacy in humans . They are known to exert anticancer effect
via different mechanisms such as carcinogen inactivation, antiproliferation, cell cycle arrest, induction of apoptosis and differentiation,
inhibition of angiogenesis, anti-oxidation and reversal of multidrug resistance or a combination of any two or more of these mechanisms .
Irrespective of their natural or synthetic origin, anticancer agents based on heterocycles are an important tool in the fight of mankind against
Catalysis is an enormous field, encompassing everything from the study of
fundamental physical properties to genetically engineered chemical-producing
microorganisms. Thus, catalysis is the area of chemistry that has a tremendous impact
on society. It is fundamental to numerous endeavors such as making consumer products
we use every day, producing the drugs that keep the population healthy, helping
agriculture feed the planet, breaking down environmental pollutants in air and water,
and generating, storing and converting energy. The production of chemicals through
catalytic processes accounts for approximately 25% of the industrial energy [1-8].
Hence, this issue represents the articles that contributed to the field of organic
transformation using heterogeneous catalysts. The present issue includes three review
articles contributed by eminent research groups involved in this prominent field of organic chemistry. It provides up-to-date developments in
Dr. Pratap Singh et al. in “Carbon Nanocomposites: The Potential Heterogeneous Catalysts for Organic Transformations” reviewed the
synthesis of carbon-based nanocomposites and discussed its applications as a heterogeneous catalyst for various organic transformations such
as oxidation, hydrogenation, coupling, and multi-component reactions .
Dr. Singh et al. in “Use of Bimetallic Nanoparticles in the Synthesis of Heterocyclic Molecules” comprehensively summarized the list of
names of plants that were used for the synthesis of bimetallic nanoparticles. In this review, the authors also discussed the application of
bimetallic nanoparticles for the synthesis of the heterocyclic molecules containing one, two, and three nitrogen atoms in the ring .
Dr. Mohammadi Ziarani et al. in “The Synthesis and Application of Functionalized Mesoporous Silica SBA-15 as Heterogeneous
Catalyst in Organic Synthesis” depicted the dual nature of functionalized mesoporous silica SBA-15 for different types of organic reactions.
The authors also showed the plausible mechanism for the synthesis of organic compounds such as 4-aryl-methylene isoxazole-5(4-H)-ones, 3-
As guest editors, we would like to appreciate all the authors for their valuable contributions and all the referees for their excellent work in
reviewing the submitted manuscripts. We are also grateful to the Editor-in-Chief Prof. György Keglevich and the Editorial Manager Ms.
Sanober Maqbool for their kind support in preparing this thematic issue.
To design various structurally diverse molecular entities, carbon-carbon and carbon-heteroatom bond-forming
reactions have been regarded as the most significant tools among many others [1, 2]. A variety of carbon-carbon
or carbon-heteroatom bond-forming strategies are being designed for the synthesis of a large number of
commercially available drug molecules, bioactive heterocycles, pharmaceuticals, agrochemicals, hormones,
vitamins, dyes, pigments, etc. Constant efforts have been made to make these versatile tools more effective and
sustainable by developing new methods or modifying existing protocols [3, 4]. As a result, a huge number of
methods are being reported almost every day related to carbon-carbon and carbon-heteroatom bond formation
under greener conditions [5-15]. This thematic issue titled ‘Carbon-Carbon and Carbon-Heteroatom bond-forming
reactions under greener conditions’ has been focusing on some of the recent carbon-carbon and carbon-heteroatom
bond forming strategies with special emphasis on greener aspects.
The first part of this thematic issue was published in two separate parts i.e. Part-1A which was constructed with five important review
articles [16-20] and Part-1B compiled with three valuable review articles [21-23]. Under the same direction, this present thematic issue i.e.
Part-2 represents six valuable review articles contributed by the eminent research groups. This special issue highlights up-to-date literature on
the following six selected topics:
The first contribution of this thematic issue titled ‘A Review of Recent Advances in the Green Synthesis of Azole- and Pyran-Based
Fused Heterocycles using MCRs and Sustainable Catalysts’ by Kerru et al. describes the synthesis of various azole/pyran annulated
heterocycles by following carbon-nitrogen or carbon-oxygen bond forming strategies via one-pot multi-component reactions using
environmentally benign sustainable catalysts .
The second contribution titled ‘An Updated Coverage on Synthesis of Benzo[b]thiophenes via Transition-Metal-Catalyzed Reactions: A
Review’ by Ejaz et al. summarizes handful literature related to the facile and convenient synthesis of structurally diverse benzo[b]thiophene
derivatives using various transition metals as catalysts .
Use of hypervalent iodine reagents is one of the fascinating areas of today’s research. The third contribution titled ‘Formation of Carbon-
Nitrogen Bond Mediated by Hypervalent Iodine Reagents Under Metal-free Conditions’ by Yang et al. highlights the latest developments on
various types of carbon-nitrogen bond formations involving hypervalent iodine reagents under metal-free reaction conditions .
Recently, dihydro[1,3]oxazine derivatives have gained significant attention due to their huge biological applications. The fourth
contribution titled ‘Syntheses, Biological and Material Significance of Dihydro[1,3]oxazine Derivatives: An Overview’ by Lathwal et al.
describes various synthetic strategies, detailed biological evaluation and material significance of a series of dihydro[1,3]oxazine derivatives
Quinoline and its derivatives have been found to possess a wide range of biological activities. A large number of methods were designed
for the synthesis of these biologically significant scaffolds under various reaction conditions. The fifth contribution titled ‘Facile Synthesis of
Quinolines in Water’ by Borah et al. compiles the latest developments on aqueous-mediated synthesis and fictionalization of various
quinoline derivatives .
Last decade has shown huge applications of sulfonic acid functionalized calix[n]arenes as an efficient, metal-free, commercially available,
low-cost organocatalyst for various organic transformations. In the last contribution titled ‘p-Sulfonic Acid Calix[n]arene Catalyzed Synthesis
of Bioactive Heterocycles: A Review’, we have demonstrated the catalytic applicability of p-sulfonic acid calix[n]arenes as an efficient
organocatalyst for the synthesis of various biologically promising scaffolds .
I am very much thankful to all the contributors for their valuable efforts to build up this special thematic issue for Current Organic
Chemistry (COC). I am grateful to the senior journal manager and the entire editorial team of Current Organic Chemistry, specially Ms.
Sanober Maqbool and Ms. Nuzhat Gul for their continued support. No words are sufficient to express my gratitude to Prof. (Dr.) Gyorgy
Keglevich (Editor-in-Chief) for continued support and guidance. I am also thankful to the respective reviewers for their efforts and
suggestions to improve the quality of this special issue.
The recent interest in the synthesis of a wide range of functionalized biologically active molecules was driven
by the ever growing demands of the pharmaceutical industry [1-3]. The synthesis of complex molecules with
different active pharmacophores has been achieved by adopting tailored synthetic approaches. The traditional
methods for the synthesis of biologically active molecules have several drawbacks, including multi-step
approaches, low isolated yields, longer reaction times, tedious purification procedures, employing toxic catalysts
and reagents, and harsh reaction conditions [4-6]. To avoid such drawbacks, different modern synthetic strategies
have been recently developed for the synthesis of bio-active molecules. Among these, one-pot multicomponent
reactions, C-H activation reactions, nanocatalysis, mechanochemical reactions using ball milling, microwave
assisted synthesis, visible light assisted photocatalytic reactions, and sonochemical organic synthesis have
attracted great attention for clean organic synthesis. The fast and growing developments in this field are
overwhelming, and call for special efforts to collect relevant information for the benefit of academics and individuals involved in the
pharmaceutical industry. This thematic issue is dedicated to highlighting the modern progress in developing various strategies for the
synthesis of bio-active molecules, with special emphasis on greener synthesis routes [7-12].
The present issue includes eight review articles contributed by eminent research groups involved in this prominent organic chemistry
field, which provide up-to-date developments in selected topics. In summary:
The first contribution titled ‘Microwave: A Green contrivance for the Synthesis of N-Heterocyclic Compounds’ by Lambat et al.
highlights the microwave mediated catalytic reactions used for the synthesis of a diversity of N-heterocycles by multi-component reactions
(MCRs) and a variety of miscellaneous reactions. The review also addresses some aspects of the use of nanoparticles for a diversity of
applications in microwave chemistry .
The second contribution titled ‘Methods and Strategies Used in Green Chemistry: A Review’ by Pottoo et al. summarizes the literature
associated with the development of various compounds and greener techniques such as ultrasound-assisted method, microwave-assisted
method, green solvent reactions, solvent free reactions, biomolecules and nano-formulations as new safe approaches .
The third contribution, titled ‘Review on Synthesis of Bio-Active Coumarin-Fused Heterocyclic Molecules’ by Banerjee et al., describes
the various methods for synthesizing different classes of coumarin-fused heterocyclic molecules and their applications in chemical, optical,
pharmaceutical and other useful applications .
The fourth contribution titled ‘CO Surrogates: A green Alternative in Palladium Catalyzed CO Gas Free Carbonylation reactions’ by
Ahmed Abdala and Lambat et al. addresses the recent developments in palladium-catalyzed carbonyl insertions without the direct use of
gaseous CO .
The fifth contribution, titled ‘Recent Advances in On-Water Multicomponent Synthesis of Coumarin Derivatives’ by Penta et al.
addresses the one pot multicomponent synthesis of structurally diverse coumarin scaffolds in water as an efficient and green medium .
The sixth contribution titled ‘Palladium-Catalyzed Cascade Reactions for Annulative π-Extension of Indoles to Carbazoles through C-H
Bond Activation’ by Jana et al. is concerned with the survey of recent literature on palladium-catalyzed π-extension of indole to carbazole
moiety through C-H bond activation .
The seventh contribution titled ‘Modern Progress in Iron-Catalyzed Reactions towards the Synthesis of Bioactive Five- and Six-
Membered Heterocycles’ by Adak et al. discusses the catalytic applicability of iron and its derivatives for various organic transformations and
the synthesis of biologically active five and six membered heterocyclic compounds .
The last contribution, titled ‘Green Approaches for the Synthesis of Indole Derivatives and their Pharmaceutical Applications: Last Ten
Years Developments’ by Das et al. discusses the various synthetic methods for the preparation of structurally diverse indole scaffolds using
green chemistry and their pharmaceutical relevance .
As Guest Editors, we would like to appreciate all the authors for their valuable contributions and all the referees for their excellent work
in reviewing the submitted manuscripts. We are also grateful to the Editor-in-Chief Prof. György Keglevich and the Editorial Manager Ms.
Sanober Maqbool for their kind support in preparing this Thematic Issue.
Synthetic peptides and amino acids are important sources for developing new drugs, because they have low
toxicity and specificity, are less prone to side effects, and have the advantage of being low-cost. However,
peptides and amino acids have some limitations from the pharmacological point of view, because of their low
residence time in the body and low effective concentration at the site of action, which is mainly due to factors such
as susceptibility to enzymatic degradation, rapid elimination, and low ability to penetrate across membranes [1-3].
The bioavailability and bio-distribution of peptides and amino acids in the body can be improved by chemical
modification. In this context, chemical synthesis can allow obtaining linear, cyclic, polyvalent, and chimeric
peptides, among others. In addition, peptide biological activity can be enhanced by incorporating unnatural amino
acids, steroids, hormones, organometallic compounds, carbohydrates, lipids, antibiotics, organic compounds,
inorganic compounds, etc. This functionalization can be performed directly on the peptide or on the amino acids
that generate the building blocks that are conjugated with these molecules, which can then be used as precursors in order to obtain the
peptides and proteins [4-8].
This thematic issue is a review of the synthetic approaches developed over the last few years for enhancing the biological activity of
promising peptide sequences. Researchers with recognized expertise in organic synthesis as a tool for the development of molecules for
biomedical applications participated in preparing the issue. A brief description of each of these contributions is given below.
In the manuscript entitled “The Role of αvβ6 Integrin Binding Molecules in the Diagnosis and Treatment of Cancer”, Dr. Urquiza, et al.
describe the importance of integrin in cancer treatment and discuss peptides, recombinant proteins, non-peptide molecules, and αvβ6-
antibodies that specifically bind to αvβ6-integrin. In addition, the biological properties and possible uses of these molecules in cancer imaging
and therapy are described since the αvβ6-integrin is over-expressed in most tumor cells .
In the manuscript entitled “Resorcinarenes: Generalities and Their Role in the Modification and Detection of Amino Acids”, Dr.
Maldonado, et al. present a valuable review of the properties and characteristics of resorcinarenes, as well as the main synthetic routes used
to form amino acid-conjugated macrocycles that could have multiple applications in the pharmaceutical sciences, engineering, and medicine
In the manuscript entitled “Ferrocene and organotin (IV) conjugates containing amino acids and peptides: a promissory tool for searching
for new therapeutic and diagnostic tools”, Dr. Farfan, et al. describe the synthesis strategies used for the preparation of amino acids and
peptides containing ferrocene or organotin (IV) derivatives. In addition, the antibacterial and/or anti-cancer properties of these organometallic
compounds are summarized .
In the manuscript entitled “Designing short peptides: a Sisyphean task”, Dr. Rivera, et al. review the synthetic approaches and strategies
used to design short peptides, highlighting the achievements, limitations, and advantages of each method. The advantage of short peptides lies
in their stability, ease of production, safety, and low cost, as well as their biomedical and industrial applications .
In the manuscript entitled “Development of strategies for glycopeptide synthesis: an overview on the glycosidic linkage”, Dr. Garcia, et
al. present a review of the chemical synthesis of glycoconjugates in solution and/or solid phase. Several methods for the synthesis of
glycosylated amino acid derivatives and/or glycopeptides and their use as drugs to mitigate the impact of microbial resistance and/or cancer
are described .
In the manuscript entitled “Electrochemical Detection of Neurotransmitters in the Brain and Other Molecules with Biological Activity on
the Nervous System”, Dr. Bustos, et al. describe the electrochemical techniques used for in vitro or in vivo detection of neurotransmitters and
other molecules with biological activity at the level of the central nervous system, as a contribution to the diagnosis of neurological diseases
In the manuscript entitled “Bio-organometallic Peptide Conjugates: Recent Advances in their Synthesis and Prospects for Biomedical
Application”, Dr. Guzman, et al. review synthetic strategies for obtaining organometallic peptides and amino acids containing ferrocene,
rutenocene, cimantrene, or osmocene. The authors describe SPPS and/or click chemistry-based methods used for obtaining organometallic
compounds that could be used to develop a new generation of antimicrobial and chemotherapeutic drugs .
Finally, as Guest Editor of this issue, I would like to express my thanks to all the authors for their high-quality manuscripts and to the
reviewers for their time and effort in providing constructive critiques in order to guarantee the excellence of this issue. I am also thankful for
the logistical assistance of Ms. Sanober Maqbool, Editorial Manager, during the submission and review procedures.
This Special Issue covers the hot topics on recent synthetic interest in halogen and related
chemistry as well as the unique characteristics of halogen compounds. The excellent reviews by the
experts and eminent researchers engaged in the recent advances, i.e., preparations, reactions, and
mechanistic studies of unique organohalogen compounds, halogen bond interaction as the catalysis,
and halogen-controlled unique reactions for synthesizing useful organic molecules, such as
pharmaceutical compounds and organic materials, are provided in this Special Issue.
Carbon-carbon and carbon-heteroatom bond-forming reactions are the most important tools for the syntheses of structurally
diverse molecular entities . Various drug molecules, bioactive heterocycles, agrochemicals, dyes, pigments, pharmaceuticals,
vitamins, hormones and other useful organic substances are being synthesized via these carbon-carbon and carbon-heteroatom
bond-formation strategies. Therefore, under these environmentally conscious days, constant efforts have been made to design
new methods or modify existing protocols for such bond-forming reactions to make them sustainable [2, 3]. As a result, the last
decade has shown a tremendous outburst to carry out carbon-carbon and carbon-heteroatom bond-forming reactions under
environmentally benign and sustainable conditions [4-10]. The thematic issue ‘Carbon-Carbon and Carbon-Heteroatom Bond-
Forming Reactions Under Greener Conditions’ is aimed to highlight some of the recent developments In carbon-carbon and
carbon-heteroatom bond forming reactions with special emphasis on greener aspects.
The first part of this thematic issue, i.e., part-1A included five significant review articles [11-15]. The present part of this
thematic issue, i.e., part-1B is composed of three valuable review articles contributed by the eminent research groups working
on this fascinating field of organic chemistry. This part of the special thematic issue offers up-to-date literature on the following
three selected topics:
The first contribution of this part of the thematic issue titled ‘Green Chemistry Approaches to the Synthesis of Coumarin
Derivatives’ by Molnar et al., describes various green synthetic approaches for the synthesis of diverse coumarin derivatives
The second contribution, titled ‘Construction of Carbon-Carbon and Carbon-Heteroatom Bonds: Enabled by Visible Light’
by Mondal and Mukhopadhyay, summarizes the literature associated with the recent advancements on green visible lightmediated
carbon-carbon and carbon-heteroatom bond-forming reactions .
In the last contribution titled ‘Formation of Carbon-Carbon Bonds Mediated by Hypervalent Iodine Reagents Under Metalfree
Conditions’, Prof. Du and his research group highlight the recent advancement in the construction of carbon-carbon bonds
utilizing hypervalent iodine reagents under metal-free condition .
I am grateful to all the contributors for their valuable efforts to organize this part of the special thematic issue for Current
Organic Chemistry (COC). I am very much thankful to the senior journal manager and the entire editorial team of Current
Organic Chemistry, specially Ms. Sanober Maqbool and Ms. Nuzhat Gul, for their continued support. No words are sufficient
to express my gratitude to Prof. (Dr.) Gyorgy Keglevich (Editor-in-Chief) for his unconditional help and encouragement. I am
also thankful to the respective reviewers for their efforts and suggestions to improve the quality of this special thematic issue.
Carbon-Carbon and Carbon-Heteroatom Bond-forming Reactions under Greener
The Chemistry of Allenes
Nowadays, environmental pollution/deterioration and greenhouse effect are becoming increasingly prominent, primarily due
to the dependence and overuse of fossil source [1, 2]. As a result, the development of green and sustainable approaches has
become a particularly important theme in recent years [3-5]. Organic synthesis is a versatile tool in the design and creation of
desirable scaffolding molecules, while the processes of which typically involves toxic and non-renewable starting materials as
well as the formation of waste or by-products . Biomass, on the other hand, is considered as the most abundant organic
carbon resource for producing liquid fuels and value-added chemicals through an array of cascade chemocatalytic reactions [7-
10]. The exploration of robust and green technologies is accordingly being deemed to be one of the vital and promising means
for biomass valorization and relevant organic transformations.
This thematic issue thereby aims to survey the development of green technologies for catalytic upgrading of biomass
feedstocks, and provides a glimpse into successful examples in this research area. Five eminent research groups in the field of
biomass valorization have kindly accepted our invitation to participate in this special issue by providing an overview on the
recent advances on selected topics briefly listed as follows:
Dr. Chen et al. in “Lignin Reactions and Structural Alternations under Typical Biomass Pretreatment Methods” introduce
typical pretreatment methods such as hydrothermal pretreatment, alkaline pretreatment, biodegradation, and oxidative
pretreatment, with their corresponding impacts on the lignin structures and reactions .
Dr. Lin et al. in “Chemoselective Hydrogenation of Biomass-derived 5-hydroxymethylfurfural into Furanyl Diols”
comprehensively summarize the studies on the chemoselective hydrogenation of 5-hydroxymethylfurfural into furanyl diols in
terms of different H-donors, including molecular H2, alcohols, formic acid and other alternative H-donors, and also provide
future research direction on the production of furanyl diols .
Dr. Li et al. in “Alcohol-mediated Reduction of Biomass-derived Furanic Aldehydes via Catalytic Hydrogen Transfer”
depict alcohol-mediated reduction of biomass-derived furanic aldehydes via catalytic hydrogen transfer, also with attention on
the representative reaction mechanisms and selective control of product distribution .
Dr. Liu et al. in “Catalytic Hydrogenolysis of Biomass-derived Polyhydric Compounds to C2–C3 Small-molecule Polyols: A
review” describe the catalysts and catalysis for selective hydrogenolysis of these polyhydric compounds to C2–C3 polyols, and
outline the reaction pathways with the state-of-the-art technologies for the target polyol formation based on the C3, C5, and C6
polyhydric alcohol hydrogenolysis .
Dr. Yang et al. in “Chemo-catalytic Esterification and Transesterification over Organic Polymer-based Catalysts for
Biodiesel Synthesis” discuss catalytic valorization of sustainable feedstocks into biodiesel via transesterification and
esterification reactions mediated by functionalized organic polymers-based catalysts, with special emphasis on the synthetic
routes to the versatile organic polymers-based catalytic materials .
As Guest Editors, we would like to appreciate all the authors for their valuable contributions and all the referees for their
excellent work in reviewing the submitted manuscripts.
We are also grateful to the Editor-in-Chief Prof. György Keglevich and the editorial manager Ms. Sanober Maqbool for
their kind support in preparing this thematic issue.
Waste-to-valuable products are being considered as one of the best solutions to convert the waste biomass into green and
environment-friendly products. The wide utilization of waste biomass as a potential source of fuels, power, recycled materials,
valuable chemicals are well recognized globally. The waste driven fuels are used in all sectors of society for production of
electricity, transport fuel, heating and cooling source, and for industrial processes. These fuels not only solve the waste disposal
issues but also generate enormous economic and environmental benefits. They are promising alternatives due to their
renewable, sustainable and eco-friendly features. However, there are multiple challenges in conversion and efficient utilization
of waste biomass into sustainable energy and fuels .
The purpose of the special issue, titled “Waste Biomass Utilization for Value-added Green Products” is to focus on the best
possible ways to convert the waste biomass into value added and renewable products with an ambition to highlight the recent
trends targeting the challenges and opportunities in this area. Renowned researchers have accepted our invitation to contribute
their articles on the below subtopics;
Conversion/Utilization of Waste Biomass Feedstocks into Fuels: The aspects of discovery and utilization of different waste
biomass feedstocks for generation of various fuels. The examples of such waste biomass to fuels systems include the bioalcohols,
biodiesel, biogas, biohydrogen, and pyrolysis oils [2, 3]. The issue will cover a wide range of feedstock and
conventional and new production methods including the challenges and prospects. In the last few decades, due to the everincreasing
exploitation of fossil fuels, there is a significant emphasis and demand on exploring and developing alternative, costeffective,
and non-food feedstocks or waste biomass sources for producing fuels and value-added products .
Micro-Algae and Macro-Algae Based Biofuels: In the last few decades, there has been tremendous research on the
utilization of micro and macro algae for biofuels production and increasing the process efficiency and quality of the products
. Despite all these efforts and investment, there remain many challenges and scope for improvement in this area before
potential commercialization of this technology worldwide. Multiple benefits are sought through these processes including biowaste
treatment, production of clean fuels and CO2 capturing for huge environmental and economic benefits. Contributions
under this subtopic would be preferred covering both the scientific and engineering aspects of algae biofuels.
Development of Advanced Catalysts for Biofuels: The role of catalysts is critical not only in the conversion process of
biofuels systems but also making the overall process more efficient, less energy intensive and economically feasible. However,
the primary challenge with the use of catalysts is huge cost. Recently, waste biomass-based catalysts such as biochar and
natural minerals like natural zeolite are utilized instead of costly commercial catalysts . Therefore, this subtopic would cover
how such cheap and effective catalysts could be developed for various biofuels systems such as transesterification (biodiesel),
anaerobic digestion (biogas), fermentation (bio-alcohols) and bio-hydrogen .
State-of-the-art Cost-Effective Bioenergy Production Technologies: This subtopic would cover the state-of-the-art and costeffective
bioenergy production technologies such as pyrolysis, supercritical water reforming, gasification, anaerobic digestion,
torrefaction, and liquid phase processing . Currently, one of the most limiting factors of bioenergy production technologies is
the high capital/ operational cost or low profitability. New ideas and paradigm will be gathered to contribute solving this issue
through this special issue. A primary emphasis would be given to such contributions which would cover the scientific aspects of
process and products chemistry.
Use of Waste and Non-profitable Natural Resources for Optimization of Biofuel Production: This subtopic would cover the
utilization of waste and non-profitable natural resources such as lands, water, and biochar, natural minerals in optimizing the
first and second generation biofuels such as bioalcohols (ethanol or methanol), biomethanation and biodiesel.
Life Cycle Assessment (LCA) of Value-Added Green Products: This subtopic would cover the aspects of both biomass waste
utilization and value-added green products in the form of fuels and energy [8,9]. The established or new models of LCA should
be used for detailed technical, economic and environmental aspects of these processes and products, crucial before moving
towards commercialization. In addition, the engineering design for feedstock processing and biofuel production plants would be
covered under this subtopic.
Integration of Waste to Energy Technologies: This subtopic would cover the various waste to energy and waste-based
biorefineries systems in an integrated way. The ultimate goal is to achieve more sustainable and environmentally friendly
systems and products. The examples of such systems include the organic waste biorefinery, agricultural and forestry residues
biorefinery . Contributors are encouraged to cover the various sources of municipal and industrial waste which could be
potentially utilized for energy, fuels, heat, and chemicals production.
As Guest Editors we would like to thank all the authors for their precious contributions and all the reviewers for their
excellent work in evaluating the submitted manuscripts. We also wish to thank the Editor in Chief, Prof. György Keglevich and
the Editorial Manager Ms. Sanober Maqbool for their kind support in preparing this Special Issue.
In the last few decades, catalyzed organic and bioorganic reactions have attracted much attention in chemical and
pharmaceutical researches [1, 2]. Recently, the design of novel catalysts and enzymes is in much demand to circumvent certain
intractable synthetic problems [3-6].
In this light, the modeling of catalytic procedures seems to be necessary and also important in the synthesis of emerging
classes of organic compounds that are becoming the targets of molecular and biomedical researches [7-10].
Strictly speaking, the combination of computational approaches with experimental methods to model and interpret the
mechanistic features of catalytic and enzymatic organic reactions provides more detailed information about the structure,
bonding, stereochemistry and spectroscopic properties of compounds through the reaction path and consequently, leads to the
new opportunities for production of novel chemicals and discovery of useful drugs [10-11].
In this context, the main goal of this thematic issue is to present comprehensive joint experimental and computational
researches set in the field of catalytic organic synthesis and their rational mechanistical underpinning and the conjunction of
experimental features of catalytic and enzymatic reactions with computational approaches will be covered.
This thematic issue contains 3 reviews, written by highly knowledgeable teams with tremendous amount of experience in
the field of computational organic chemistry, which are discussed as follows:
The first article of this special issue by Laura Orian and her coworkers from the University of Padova describes the essential
synthetic and reactivity aspects of organoselenides in a rational combination with the results of computational studies. In this
line, reactivity of the Se-Se bond and the redox properties of selenium are discussed to produce diselenides compounds for the
catalysis of many organic reactions and along with its enzymatic application as glutathione peroxidase, inspiring novel
elements for rational catalyst, enzymes and drug design.
The second review is provided by Ana María Mendoza-Wilson and her colleague on chemical structure and reactivity of
procyanidins. Clearly speaking, in this review, the recent advances of experimental and computational studies on the potential
of procyanidins as metalloproteinases inhibitors were investigated. In the last review article of this special issue by Tayebeh
Hosseinnejad and Majid M. Heravi and their co-worker, Hantzsch dihydropyridines synthesis and their biological activities and
also their applications in asymmetric transfer hydrogenation are investigated from the combined experimental and computational
As a result, the thematic issue contains the reviews of emerging and cutting edge researches in the field of computational
chemistry and modeling and hopefully attracts substantial attentions and stirs up the interest of readers in the related research
community. Finally, I would like to acknowledge all the contributing authors, reviewers and the Editorial Office for their
consistent efforts in bringing out this special issue.
Solid Phase Organic Synthesis (SPOS) was first introduced for peptide synthesis and is pioneered by R. B. Merrifield,
which later earned him a Nobel Prize in Chemistry in 1984 [1, 2]. The solid-phase synthesis carries many advantages over
classical solution-phase synthetic methods which may include purification of products by simple filtration of the polymer
matrix , automatability , easy handling, low moisture susceptibility , minimum side reaction, polymerization-free due
to site-isolation of polymer beads  and recyclability of the polymer matrix for repeated useage [7, 8]; thereby adding the
‘green’ credentials of the whole processes.
Earlier, SPOS mainly refers to a multi-step organic synthesis using a polymer-bound reagent. However, these days, the
single step organic synthesis using polymer and/ or other solid catalysts/ reagents is also included in SPOS domain.
In recent years, polymer-bound reagents/ catalysts have received major attention from industry and academia mainly due to
their easy handling, separation, and reusability [9-12]. In addition, as polymeric reagents/catalyst can be recycled and reused,
they can be used in an excess amount to drive the reaction faster.
In this special issue, different reviews related to SPOS have been contributed by experts in these fields of research:
In the paper by Prof. Ilia and co-worker entitled “Solid-Phase Synthesis of Phosphorus Derivatives”, different approached
for the solid phase synthesis of oligonucleotides, nucleobases, nucleoside, phosphates and phosphonates are extensively
Prof. Ohtaka in the paper “Transition-Metal Nanoparticles Catalyzed Carbon-Carbon Coupling Reactions in Water” reports
the most important advances in Carbon-Carbon bond formation reactions such as Suzuki coupling, Heck reaction, Sonogashira
coupling, Stille coupling, Hiyama coupling and Ullmann coupling catalyzed by different transition metal nanoparticles.
The final contribution to this special issue is provided by Rokhum et al. This review entitled “Recent Application of
Polystyrene-Supported Triphenylphosphine in Solid Phase Organic Synthesis” covers several applications of polymer-bound
triphenylphosphine as a catalyst as well as a regent in different chemical transformations such as Henry reaction, Wittig
reaction, Mitsunobu reaction, esterification reaction, and cross-coupling reaction.
As Guest Editors we would like to take this opportunity to thank all the authors who have kindly agreed to our invitation
and contributed a review for this special issue. We also wish to thank all the reviewers for their support in evaluating the
We sincerely thank the Editor-in-Chief, Prof. György Keglevich and the Editorial Manager Ms. Sanober Maqbool for their
constant support in the successful publication of this special issue. It has been a great pleasure to work with Bentham Science
In the last decades important challenges have been overcome due to the comprehension of the
supramolecular organic chemistry. Non-covalent interactions and aggregation properties often play a
central role in the development of new bioactive compounds, carriers systems and delivery devices as well
as in the improvement of natural products as starting materials for innovative uses, including tissue
engineering and medicine. In many cases different techniques are required to characterize newly formed
supramolecular systems in term of dimension, morphology, microviscosity and stability, or to point out the
aggregation tendency of the investigated molecules.
Promising strategies are also based on the formation of aggregates or the inclusion of molecules into
carrier systems for new targets; the characterization of nanoparticles; the use of the therapeutic polymers;
the synthesis of molecules mimicking natural compounds; the applications of traditional or modern
techniques to highlight aggregation properties.
The aim of this special issue is to report the recent advances in topic aspects of the supramolecular organic
chemistry in a large variety of applications involving self-assembly process and including all cases in which
the supramolecular behavior represents the relevant key for future perspectives in the scientific research.
Metal-organic frameworks (MOFs), also known as porous coordination polymers (PCPs), are
constructed from the coordination of metal ions or metal clusters with organic ligands. MOF
studies have emerged as one of the most important topics in chemistry and materials science in
the past two decades. The porosities of MOF materials can be systematically tuned by judicious
selection of molecular building blocks, and a variety of functional sites/groups can be introduced
into metal ions/clusters, organic linkers, or pore spaces through pre-designing or post-synthetic
approaches. These unique advantages enable MOFs to be used as a highly versatile and tunable
platform for various applications in gas storage and separation, chemical sensing, catalysis, and
biomedicine. MOFs have some intrinsic advantages to develop as a new class of catalytic
materials, such as their ultra-high surface areas (up to 7000 m2
/g), tunable pore sizes/shapes, and
easily immobilized catalytic active centers into metal nodes or organic linkers. Also, some
catalytically active molecules or nanoparticles could be encapsulated into the cavities of MOFs.
These attractive features have led to a rapidly growing number of MOFs for heterogeneous
catalysis. The purpose of this thematic issue is to summarize and highlight the advanced
development of MOFs and their emerging applications in organic chemistry related fields. The
topic of this issue will cover several fields that be contributed from experts from organic
chemists, inorganic chemists and materials scientists: (1) The advanced development of MOFs,
such as novel synthetic approach, post-synthesis, and In situ growth mechanism studies of
MOFs; (2) Emerging and promising applications of MOFs, such as light hydrocarbon separation,
catalytic organic transformation, photocatalysis, sensing of small molecules, bioimaging and
Inflammation results from a process in response to noxious stimuli in from tissues by pathogenic
agent and / or irritated or damaged cells from an inflammatory immune response involving the
immune cells, blood vessels and molecular inflammatory mediators .
Inflammatory diseases may be provided by an acute or chronic phase. In the acute phase we have
an innate immune response by characterized flush appearance, heat and increasing the entry into
service on site . In contrast, the chronic phase is from persistent acute inflammation by the
recruitment of monocytes, leukocytes and macrophages as well as proinflammatory cytokines.
At this stage one can achieve with tissue destruction and fibrosis necrosis site . Chronic
inflammation may lead to a number of diseases such as asthma , rheumatoid arthritis ,
atherosclerosis , intestinal diseases , among others.
The objective for this thematic issue is to report recent studies about different approaches in drug
discovery, which comprises synthesis, semi-synthesis, searches for new targets, natural products,
evaluation of biological activities, and/or theoretical approaches as structure-based approaches,
SAR, QSAR, docking and several cheminformatics methods , for investigation and selection
of new lead molecules. These efforts involve several studies to aid the drug discovery of new
options of treatment of inflammatory diseases.
I propose you a revision of the state of the art in the field nanotechnology-organic chemistry.
This a very actual, wide and open area of research that is the joint of many different research
fields. Due to this fact, there is not a book or a thematic issue that gives its state of the art. Base
on this I believe that this area needs thematic issue like this. I propose to include the study of the
organic molecules that are used in the last years for the modification of surfaces (metallic or not:
mainly silicon, organic substrates as cellulose, and carbon) and the main carriers that are used in
the delivery of actives compounds, from lipid nanoparticles to nanofibres. Moreover I propose to
include a chapter focused on the delivery of antitumoral actives.
Biopolymer means the polymers which are produced in a natural way by living species. In general their
molecular structures are composed of the units of saccharides, nucleic acids and also different additional
chemical side chains contributing to their consequences. The utilization of the biopolymers by Humans
comes under the category of food, clothing and furniture. On the other side if we talk about the industrial
applications of biopolymers, then it is found that fossil fuels are the substantial origin for the manufacture
of the commercial products for example, plastics which is presently used at very high scale. Some of the
biopolymers examples are such as Proteins, Carbohydrates, Lipids, DNA, RNA, Nucleic acids, Peptides,
Polysaccharides (glycogen, starch, cellulose etc.). There are basically four main classifications of
biopolymers available considering both natural and synthetic polymers carbohydrate based biopolymer,
starch based biopolymer, biopolymers based on synthetic materials and cellulose based biopolymers. In
this issue we are mainly focusing on the history and origination of the biopolymers, their classifications
and biopolymer based formulations such as Biocomposites etc.. We will also discuss about the various
applications of these biopolymer formulations in the field of biomedical engineering and industrial fields.
Sugar based polymers, such as polylactides, naturally degenerate in the human body without producing
any harmful side effects. Polylactides are generally used as surgical implants. Starch based biopolymers
can be used for creating conventional plastic by extruding and injection molding. Biopolymers based on
synthetic are used to manufacture substrate mats. Cellulose based biopolymers, such as cellophane, are
used as a packaging material.
In the Thematic Issue “Transformation of POPs in the environment" the selected organic
micropollutants listed by Stockholm convention as well as micropollutants listed in some other
international and national law legislations will be described. There will also be characterized
some other organic micropollutants that are not listed in current legislations but they cause
hazard for health and people life due to their estrogenic biological activity, carcinogenic,
mutagenic or teratogenic activity. The organic micropollutants include: polychlorinated
dibenzodioxyns PCDD, polychlorinated dibenzofurans PCDF, polychlorinated biphenyls PCBs,
selected insecticides and pesticides, polycyclic aromatic hydrocarbons (PAHs), halogenated
compounds (determination as AOX) and by-products of water treatment, di-2-
ethylocsylophtalans DEHP, nonylphenols NPE and ethoxylated of nonylphenols compounds
NPEO and some surfactants, such as linear alkylo benzosulphonans LAS. Moreover, the current
topic is the presence in the environment emerging organic contaminants as well as biologically
active substances so called as endocrine disrupting compounds such as: pharmaceutics and
cosmetics remains and bactericidal compounds (personal care products PCP), flame retardants
Frs and preservatives and impregnates.
Due to their essential roles in photosynthesis, chlorophylls are omnipresent from photosynthetic
prokaryotes to higher plants, being considered the most important pigments on Earth. Such vital
function derives from its structure, chlorophylls can absorb light quanta effectively, but also they
can release and take up electrons reversibly. Chlorophylls are cyclic tetrapyrroles carrying a
characteristic isocyclic five-membered ring that are functional in light-harvesting or in charge
separation in photosynthesis. The general term ‘chlorophylls’ includes several kinds of
chlorophyll structures depending of the unsaturation degrees of the macrocycle. Fully
unsaturated porphyrin macrocycle is present in c-type chlorophylls of chromophyte algae and
some prokaryotes. The chlorin system shows a saturated bond between C17-18 and it is present
for example in the chlorophylls a and b of oxygenic organism and in some bacteria. Finally, the
bacteriochlorin type exhibits two saturated bonds at C7-8 and C17-18, and it has been described
in bacteriochlorophylls of anoxygenic bacteria. During the last year, mass spectrometry has been
used successfully to obtain information of the structural configuration of the different
chlorophylls, not only related with identification and characterization but also providing insights
of the mechanism of reaction. The present theme issue will review the recent developments in
the field of mass spectrometry covering different chlorophyll structures.
It has become the scientific focus to advance the synthesis methods and the analysis techniques
for organic materials because of these materials’ importance in food, pharmaceutical and medical
industries. A good understanding of the properties of a material (e.g., composition, chirality,
structure, thermal stability and phase transformation) is crucial for food processing and safety,
drug design and manufacturing and medical applications. Thus there’s an increasing demand for
a wide range of modern characterisation techniques.
This proposed thematic issue will try to present the latest advances, trends and challenges in
modern synthesis methods and analysis techniques by collecting the review articles on some
emerging techniques (e.g., 3D printing, small angle X-ray scattering) as well as some more
traditional techniques (e.g., nuclear magnetic resonance, differential scanning calorimetry and Xray
diffraction). It will also highlight some in-situ monitoring techniques (e.g., the simultaneous
X-ray diffraction- differential scanning calorimetry technique for the characterization of solid
Chitosan, a natural polymer obtained by alkaline deacetylation of chitin, is the only cationic
polysaccharide in nature. Chitosan could be chemical modified by different ways, such as
oligomerization, alkylation, acylation, quternization, hydroxyalkylation, carboxyalkylation,
thiolation, sulfation, phosphorylation, enzymatic modifications and graft copolymerization along
with many assorted modifications. Then many derivates of chitosan could be obtained. Chitosan
and its derivates show excellent biological qualities: they are biocompatible, biodegradable,
mucoadhesive and non-toxic, and exhibit antimicrobial, antiviral gene transfection and
immunoadjuvant properties. Chitosan and its derivates have a variety of promising applications
in medicine and pharmaceutics and are presently considered as a novel carrier material in drug
delivery systems, gene therapy, tissue engineering scaffold, wound healing, antibacterial, fat
binder, hemostatic agent, hypocholesterolemic effect as indicated by the large number of studies
published over the last few years. They can be easily processed in diverse forms, such as
membranes, microparticles/nanoparticles, fibres, hydrogels or sponges, and allowing the design
of a variety of medical and pharmacological devices adaptable to end purposes. In this special
issue, I’ll bring together a number of top-ranked international scientists to discuss the recent
advances about the strategies for design, synthesis, functionalization and applications of chitosan
and its derivates for applications in medical materials. This special issue is aiming for a broad
audience of readers in the field of material sciences, chemistry, medicine and pharmaceutics.
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