Green Access to Multi-Component Synthesis of Spiropyranopyrazoles
作者:D. Pore、P. Hegade、D. Gaikwad、P. Patil、J. Patil
DOI:10.2174/15701786113106660069
日期:2014.1.31
A catalyst-free multi-component synthesis of spiro[indoline-3,4’-pyrano[2,3-c]pyrazoles] is reported from in
situ formed pyrazolone by exothermic reaction of ethyl acetoacetate with hydrazine hydrate, isatin and malononitrile in
water at room temperature. A suggested mechanistic approach was supported by semi-empirical calculations. The
transformation is carried out in water alone and thus achieved the highest level of green chemistry. Simple reaction
conditions, easy work-up procedure and isolation of products are the auxiliary advantages of present protocol.