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■ A Convenient K₂CO₃ Catalysed Regioselective Synthesis for Benzopyrano[4,3-c]pyrazoles in Aqueous Medium

Mazaahir Kidwai,* Priya, Kavita Singhal, and Shweta Rastogi

*Green Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi-110007, India

Abstract

This synthetic approach features heterocondensation reaction between in situ generated 3-arylidene-2,4-chromanediones and N-substituted hydrazine moiety avoiding the use of organic solvents at any stage. Water as solvent is taken for the synthesis of selective benzopyranopyrazole derivatives under microwaves (MWs). Hydroxy coumarin moiety is employed for this ecofriendly strategy.