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

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.