Iodine-Catalyzed [3+2]-Cyclization of Substituted Benzylidenemalononitriles and Ethyl Glycinate Hydrochloride: Direct Access to 5-Amino-1H-pyrrole-2-carboxylates

Abstract

An iodine-catalyzed [3+2]-cycloaddition reaction of substituted benzylidenemalononitriles and ethyl glycinate hydrochloride in DMF has been developed for the synthesis of 5-amino-1H-pyrrole-2-carboxylates. This efficient method provides access to a variety of structurally diverse pyrrole-2-carboxylate derivatives. The structure of a typical product was confirmed by X-ray crystallography.