Facile Synthesis of Some Novel Spiro[indole-3, 4'-dipyrrolopyran]Derivatives

Abstract

A facile synthesis of novel spiroindole derivatives, spiro[3H-indole-3, 4'-2', 3', 4', 5', 6', 7'-hexahydro-1H-pyrano-[2, 3-b : 6, 5-b']dipyrrole[-2(1H)-ones (IV), together with 2, 3-dihydro-3-(2, 3, 4, 5-tetrahydro-2-oxo-1H-pyrrole-3-ylidene-1H-indol-2-ones (II), was achieved by dry heating of substituted indole-2, 3-diones with 2-pyrrolidinone or N-methyl-2-pyrrolidinone.