Studies on the Synthesis of Indole Related Compounds. II. Diels-Alder Reaction of Phenacylidene Indolinone

Abstract

The Diels-Alder reactions of N-acetyl-3-phenacylidene-2-indolinone (VII) with dienes are reported. VII reacts with cyclohexadiene, cyclopentadiene and butadiene to afford VIII and IX, XIV and XV, and XIX, respectively. Mass spectra of VIII, IX, X and XII are recorded and discussed on their cleavages.