Title:Diversity Oriented Synthesis of 4H-Pyrimido[2,1-b]benzothiazole Derivatives via Biginellis Reaction: A Review
VOLUME: 21 ISSUE: 4
Author(s):Divyani Gandhi, Priyanka Kalal, Prakash Prajapat, Dinesh Kumar Agarwal and Shikha Agarwal*
Affiliation:Department of Chemistry, Synthetic Organic Chemistry Laboratory, Mohanlal Sukhadia University, Udaipur, 313001 Rajasthan, Department of Chemistry, Synthetic Organic Chemistry Laboratory, Mohanlal Sukhadia University, Udaipur, 313001 Rajasthan, Department of Chemistry, Synthetic Organic Chemistry Laboratory, Mohanlal Sukhadia University, Udaipur, 313001 Rajasthan, Department of Pharmocology, PAHER University, Udaipur, 313001 Rajasthan, Department of Chemistry, Synthetic Organic Chemistry Laboratory, Mohanlal Sukhadia University, Udaipur, 313001 Rajasthan
Keywords:2-Aminobenzothiazole, fused pyrimidobenzothiazole, Biginellis reaction, substituted benzaldehyde, 1, 3-diketone,
multicomponent one pot green synthesis.
Abstract:Background: Heterocycles have extended into widespread use for generating large
collection of molecules in multi-component reactions. The development of new strategies for fused
pyrimidobenzothiazole system has remained a highly attractive but challenging proposition for
scientists working all around.
Objective: The main objective of this work is to explore the utility of different catalysts as an ecofriendly
reaction medium for green Biginellis reaction.
Method: A detailed study of Biginellis reactions using various catalysts was done using different
research tools. The methods involved reaction of equimolar mixture of benzothiazole, 1,3-diketone
and aldehyde as reactants by conventional and greener pathways via Knoevenagal condensation.
Results: The present review has several significant advantages for the scientists regarding green
synthesis viz. green conditions, short reaction times, high yields, clean reaction conditions, easy
isolation of products, simple work-up procedure and mild reaction conditions.
Conclusion: Our report gives an overview of the combinatorial libraries for fused benzothiazole
entities using metal catalyst, acid catalyst, ionic liquids, phase transfer catalyst, nano catalyst, etc.
