2-Trifluoromethanesulfonyloxyindole-1-carboxylic Acid Ethyl Ester: A Practical Intermediate for the Synthesis of 2-Carbosubstituted Indoles

Abstract

Ready accessible 2-trifluoromethanesulfonyloxyindole-1-carboxylic acid ethyl ester undergoes palladium-catalyzed coupling reactions with different partners giving rise to 2-aryl, heteroaryl, vinyl, allyl, and alkynyl indoles in good to excellent yields.