This review article gives information about the recent advances in the synthesis of quinoline derivatives by various eco-friendly, green and clean protocols.

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Recent advances in various synthetic protocols of 2-substituted benzothiazole derivatives.

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The objective of this review is to summarize some of the recent advances in a sulfuric acid-modified polyethylene glycol 6000 (PEG-OSO 3 H) as a stable, recyclable and bio-degradable polymeric catalyst in organic synthesis. PEG-OSO 3 H is a highly efficient and eco-friendly catalyst, which catalyzed various organic reactions and could be recovered and reused several times without significant loss of its activity. In this review, preparation and application of PEG-OSO 3 H in organic synthesis are investigated.

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The use of heterogeneous solid acid catalysts is important to the development of sustainable chemical processes. To this end, cellulose sulfuric acid (CSA) and starch sulfuric acid (SSA) have been developed and used for a wide range of organic transformations, including the synthesis of pharmaceutically important heterocyclic compounds. These heterogeneous catalysts are easily recovered and reused several times without loss of their activity. In this review, we mainly summarize applications of these catalysts in synthetic organic chemistry.

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