Novel Sulfamic Acid–Promoted Synthesis of 3-Alkylidene Indolone Derivatives in the Presence of Aniline via One-Pot Multicomponent Reaction
摘要:
A sulfamic acid-catalyzed synthesis of 3-alkylidene indolone derivatives by addition of dialkyl acetylenedicarboxylate to isatin derivatives in the presence of aniline is reported. The reaction sequence consists of an initial Michael addition of aniline to dialkyl acetylenedicarboxylate, followed by aldol-like reaction with isatin, and then elimination of aniline to afford the product.