[EN] METHODS FOR THE PREPARATION OF ALKENYLAMINES, CYCLIC CARBAMATES OR DITHIOCARBAMATES, AND AMINOALCOHOLS OR AMINOTHIOLS [FR] PROCÉDÉS POUR LA PRÉPARATION D'ALCÉNYLAMINES, DE CARBAMATES CYCLIQUES OU DE DITHIOCARBAMATES, ET D'AMINOALCOOLS OU D'AMINOTHIOLS
A fast, efficient and stereoselective synthesis of hydroxy-pyrrolidines
摘要:
A five-step, protecting group free synthesis of 2,3-cis substituted hydroxy-pyrrolidines is presented. Key steps in the synthesis are the chemoselective formation of a primary amine via a Vasella reductive amination using ammonia as the nitrogen source, and the stereoselective formation of a cyclic carbamate from an alkenylamine. Improvement of the reductive amination, by way of the use of alpha-picoline borane as a more environmentally benign reducing agent, is also presented. (C) 2010 Elsevier Ltd. All rights reserved.