Synthesis of 1,3‐disubstituted‐5‐oxo‐7a‐methyl‐5,7a‐dihydroindoles

Abstract
Cycloaddition and addition reactions of ethyl propiolate with a series of 1,3,5‐substituted‐2‐amino‐4‐methylpyrroles to form, 1,3‐disubstituted‐5‐oxo‐7a‐methyl‐5,7a‐dihydroindoles are described. High resolution mass spectral and pmr data are presented.