ISSN (Print): 2213-3372
ISSN (Online): 2213-3380
Volume 8, 3 Issues, 2021
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ISSN (Print): 2213-3372
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SUSTAINABLE REACTIONS IN THE SYNTHESIS OF HETEROCYCLES
Guest Editor(s): Bimal K. Banik, Aparna Das
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Carbon-carbon and carbon-heteroatom bond forming reactions are the backbone of organic transformations [1, 2]. A wide
variety of metal catalysts are being employed for the carbon-carbon or carbon-heteroatom bond formations [3-6]. But in many
occasions, it was found that these catalysts are not recommendable for large scale production as there is always a certain chance
of metal contamination in the desired products. Uses of non-toxic metal-free organocatalysts are solving this problem in many
occasions. Among many other alternatives, use of organocatalysts has been regarded as the most fruitful way to avoid metal
contamination [7-10]. As a result, organocatalysis is becoming one of the safest strategies for the synthesis of various organic
scaffolds and thus metal-free organocatalysts are gaining immense attention to get rid from the ever increasing chemical pollution
associated with the organic reactions [11-15]. Scientists are continuously trying to search new or modify organic substances
which can be used as efficient catalysts. This special thematic issue ‘Organocatalyst: A valuable tool for the carbon-carbon
and carbon-heteroatom bond formations’ intends to highlight some of the recent advances on carbon-carbon and carbonheteroatom
bond formations by employing metal-free organocatalysts. The present issue consists of total of six review articles
and one research article contributed by the leading scientists working in this field.
The first contribution titled ‘Amino acids and Peptides Organocatalysts: A Brief Overview on its Evolution and Applications
in Organic Asymmetric Synthesis’ by Prof. Kantharaju Kamanna describes many outstanding developments in asymmetric
synthesis by employing amino acids or amino acids derived peptides as efficient organocatalysts under various reaction
Warfarin is a widely prescribed anticoagulant and cardiovascular drug. Under this COVID-19 pandemic situation the importance
of this type of blood thinner drugs increases rapidly. It was found that S-enantiomer of warfarin is more active than Renantiomer
as an anticoagulant. Therefore synthesis of enantiomerically pure warfarin is a challenging task. In the second contribution
titled ‘Asymmetric Organocatalyzed Warfarin Synthesis in Aqueous and Nonaqueous Media: A Discussion in the Era
of COVID-19 Pandemic’, K.C. Bhowmick and his group have summarized a large number of methods for the synthesis of enantiomarically
pure warfarin using different organocatalysts under various reaction conditions .
Heterocycles are very common in naturally occurring bioactive molecules. Heterocycles are the building blocks of many biologically
significant organic compounds. A large number of methods have been reported for the efficient synthesis of various
heterocyclic scaffolds [18-24]. The third contribution titled ‘Organocatalytic Synthesis of Heterocycles: A Brief Overview
Covering Recent Aspects’ by Sarkar and Mukhopadhyay highlights recent advances on metal-free organcatalyzed synthesis of
biologically promising heterocycles .
In the forth contribution titled ‘Organocatalyzed Heterocyclic Transformations in Green Media: A Review’ Prof. Neslihan
Demirbas and her group have summarized synthesis of structurally diverse biologically active heterocyclic scaffolds using various
organocatalysts under mild and environmentally sustainable conditions .
Cellulose sulfuric acid is a metal-free, bio-compatible, non-toxic, commercially available, low cost heterogeneous solid acid.
Recently, it is being used as an efficient catalyst for diverse organic transformations. In the fifth contribution titled ‘Recent
Advances on Cellulose Sulfuric Acid as Sustainable and Environmentally Benign Organocatalyst for Organic Transformations’,
Agarwal et al. demonstrated a variety of organic reactions carried out by using cellulose sulfuric acid as catalyst under various
reaction conditions .
Organoselenium compounds have been reported to possess a wide range of biological activities . The sixth contribution
titled ‘Organocatalysed Synthesis of Selenium Containing Scaffolds’ by Sonawane and Koketsu provides an up-to-date literature
related to the synthesis of structurally different organoselenium compounds by using various metal-free organocatalysts
Recently our group has investigated the catalytic efficiency of mandelic acid [30-32]. Mandelic acid is a naturally occurring,
mild, commercially available, low cost catalyst. In the seventh contribution titled ‘Mandelic Acid: An Efficient Organo-catalyst
for the Synthesis of 3-substituted-3-Hydroxy-indolin-2-ones and Related Derivatives in Aqueous Ethanol at Room Temperature’
we have reported another simple, convenient, mild and environmentally benign approach for the synthesis of 3-
substituted-indolin-2-ones and related derivatives using mandelic acid as an efficient organicatalyst in aqueous ethanol at room
I am very much thankful to all the contributors for their valuable contributions to build up this special thematic issue for
Current Organocatalysis (COCAT). I am grateful to the senior journal manager and the entire editorial team of Current Organocatalysis,
especially Mr. Umer Farooq for his continued support. No words are sufficient to express my gratitude to Prof. Bimal
Krishna Banik (Editor-in-Chief) for his 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.
A large quantity of organic waste is generated from our daily life and industrial or agricultural production, and it can be oxidized
for energy recovery or converted to useful chemicals through many different methods, for example, incineration, pyrolysis,
gasification, liquefaction, fermentation, composting, anaerobic digestion, etc.  In comparison to these methods, advanced
oxidation processes (AOPs) have substantial advantages of high treatment efficiency, clean and simple process, and complete
mineralization of organic pollutants . Reactive oxygen species (ROSs) can be produced in-situ using AOPs via the activation
of oxidants including O2, H2O2, O3, persulfate, Cl2, etc.  In recent years, AOPs have been widely used for the treatment of
refractory organic pollutants, sewage sludge, and industrial organic wastewater, and their rapid development is worth a deep
investigation. Under this background, the thematic issue “catalytic processes for organic wastes utilization and pollutants removal”
concludes the recent progress in catalytic oxidation of organic waste or wastewater.
Photocatalytic treatment exhibits good performance in degrading organic pollutants or transforming inorganic pollutants
without chemicals consumption, and the development of multilevel-structure TiO2-based nanocomposite catalysts is emphasized.
The first contribution of this thematic issue, titled “Photocatalytic treatment of environmental pollutants using multilevelstructure
TiO2-based organic and inorganic nanocomposites”, provides comprehensive reviews on these progresses and development
Some types of wastewater contain refractory substances like antibotics, dyes, lignin, and humic acid, and conventional biological
treatment is invalid. Catalytic air oxidation processes can achieve their mineralization in an economical way. The second
contribution of this thematic issue, titled “Catalytic air oxidation of refractory organics in wastewater” analyzes the new
findings on suitable catalysts and their mechanisms .
Sewage sludge is a complex waste sourced from wastewater treatment plants, and wet air oxidation, an efficient and clean
technology, has been put into the practice of sludge treatment. New catalysts are expected to improve the performance of this
process with strong durability and recyclability. The third contribution of this thematic issue, titled “Catalytic wet air oxidation
of sewage sludge: a review” addressed the development and challenges in this field .
I appreciate all the contributors for accepting my invitation and their valuable contribution to this thematic issue. I am
thankful to the editorial team and journal managers of Current Organocat
Indeed, it is a great pleasure to write an overview of all papers published in Current Organocatalysis
(COCAT) in 2019, volume 6 (2). The COCAT has been publishing significant research papers for the past
years. The publications in COCAT are extremely diverse since methods used are powerful in the synthesis
and biological studies of a variety of structures.
In this issue, the following papers are published. Saha and Mukhopadhyay have written the use of nanoparticles
for the synthesis of numerous heterocycles and their effective functionalization through carbon-
hydrogen bond activation. Sahoo and Banik have focused on the applications of organocatalysis in
medicinal chemistry. Pan and Ganguly have assessed chitosan-based organocatalysis. Sinha has investigated
oxidation of alcohols catalyzed by ruthenium- and osmium carbonyl complexes. Sahoo and Banik
have reported the application of Baker’s Yeast in synthesis. Mondal and Bhowmick have reported asymmetric
aldol reaction mediated by optically tartrate in aqueous media. Zhao et al. studied bifunctional
catalysts for aldol reaction by probing the remote amide hydrogen. Banerjee et al. explored on the clean
synthesis of pyran compounds using magnetically separable catalyst.
The above description demonstrates that different types of current research are included in this special
issue. Therefore, the COCAT has maintained the standard and focus of the journal. It is expected that the
publications in COCAT would assist authors to diversify their research areas. We request authors to submit
their valuable manuscripts for publication in COCAT. Your papers would undergo an unbiased peerreview
and editorial process. I sincerely appreciate all authors, reviewers and journal staff for maintaining
a high standard of Current Organocatalysis.
It gives me a great pleasure to write an overview of all papers published in Current Organocatalysis (COCAT) in
2018, volume 5 (3). There is no doubt that COCAT has established as a crucial journal in this area because organocatalytic
reactions are powerful methods in the construction of simple to complex molecular structures.
In this issue, the following papers are published. Brahmachari et al. have investigated camphor-10-sulfonic acid
as a promising organocatalyst in conducting diverse reactions. The methods are simple, economical and effective.
Biswas and Basu have described the use of Bunte salts in organic synthesis. Yadav and Banik have developed an
efficient camphor-10-sulfonic acid-catalysed protection method of carbonyl groups. Banik et al. have investigated
an environmentally benign synthetic method to access novel synthesis of substituted indoles through Michael reaction
using camphor-10-sulfonic acid as the catalyst. Farooq and Ngaini have described various synthetic routes for
the preparation of methyl-2-formyl benzoate and its importance as a precursor for the preparation of compounds
with pharmaceutical applications. Shahraki et al. have investigated the kinetics and a mechanistic elucidation of
triphenylarsine as a catalyst in a one-pot reaction for the formation of dialkyl-2(2-oxobenzo [d] oxazol-3(2H)-yl)
fumarate. Kumar et al. have studied Ionic Liquid [PyN(CH2)4SO3H][CH3PhSO3]-mediated and promoted ecofriendly
one-pot domino synthesis of benzothiazolopyrano/chromenopyrimidine derivatives. Singh et al. have investigated
sarcosine as a new and recyclable catalyst for the synthesis of multi-substituted pyrazole derivatives.
Siddiqui et al. have studied malic acid as a sustainable organocatalyst for the one-pot and multi-component synthesis
of benzopyrimido[4,5-b]quinoline in biodegradable glycerol.
It is good to note that Current Organocatalysis has expanded its scope significantly. We believe that the publications
in COCAT would help many authors to expend their research areas. The management of COCAT would consider
valuable manuscripts for publication through a rigorous peer-review and editorial process. I thank all authors,
reviewers and journal staff for maintaining a high standard of Current Organocatalysis.