Glycine-Catalyzed Efficient Synthesis of Pyranopyrazoles via One-Pot Multicomponent Reaction
摘要:
A facile and convenient protocol is developed for the fast (5-20min) and high-yielding (85-95%) synthesis of fused pyranopyrazoles from ethyl acetoacetate, hydrazine hydrate, an aldehyde, and malononitrile in the presence of nontoxic, simple, and readily available organocatalyst glycine in aqueous medium at 25 degrees C.
Rapid four-component reactions in water: synthesis of pyranopyrazoles
作者:Gnanasambandam Vasuki、Kandhasamy Kumaravel
DOI:10.1016/j.tetlet.2008.07.055
日期:2008.9
An environmentally benign four-component reaction in aqueous medium at room temperature has been developed for the synthesis of 6-amino-5-cyano-3-methyl-4-aryl/heteroaryl-3H,4H-dihydropyrano[2,3,-c]pyrazoles (C) 2008 Elsevier Ltd. All rights reserved.