Multi-component one-pot reactions for the synthesis of spirooxindole-pyrano[2,3-c]pyrazole derivatives

Abstract

A highly efficient strategy for the one-pot synthesis of multi-substituted spirooxindol-pyrano[2,3-c]pyrazole derivatives was developed. The product formed in good yield from the reaction of acetylenedicarboxylate, hydrazine, isatin, and (E)-1-methylthio-1-methylamino-2-nitroethylene in the presence of Et3N catalyst. This simple and convenient method could also be used to prepare similar types of product.