Reactions of 2-(diformylmethylidene)-3,3-dimethylindole with hydrazides: Synthesis of new pyrazolylindolenine derivatives-the unprecedented one-pot pyrazole-thiadiazole double annulation
作者:Hamid Khaledi、Hapipah Mohd Ali、Noel Francis Thomas、Seik Weng Ng
DOI:10.1002/jhet.575
日期:2011.5
p‐toluenesulfonylhydrazide and S‐benzyldithiocarbazide with diformyl yielded the expected pyrazolylindolenines as the sole products, the initial products of the reactions of diformyl with semicarbazide, thiosemicarbazide, and carbohydrazide underwent cleavage. The reaction of diformyl with thiocarbohydrazide resulted in a unique one‐pot formation of pyrazole and thiadiazole rings, conjugated with the indolenine