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.
Applications and Limitations of the I<sub>2</sub>-Mediated Carbamate Annulation for the Synthesis of Piperidines: Five- versus Six-Membered Ring Formation
作者:Hilary M. Corkran、Stefan Munneke、Emma M. Dangerfield、Bridget L. Stocker、Mattie S. M. Timmer
DOI:10.1021/jo401512h
日期:2013.10.4
A protecting-group-free synthetic strategy for the synthesis of piperidines has been explored. Key in the synthesis is an I2-mediated carbamateannulation, which allows for the cyclization of hydroxy-substituted alkenylamines into piperidines, pyrrolidines, and furans. In this work, four chiral scaffolds were compared and contrasted, and it was observed that with both d-galactose and 2-deoxy-d-galactose
A fast, efficient and stereoselective synthesis of hydroxy-pyrrolidines
作者:Emma M. Dangerfield、Shivali A. Gulab、Catherine H. Plunkett、Mattie S.M. Timmer、Bridget L. Stocker
DOI:10.1016/j.carres.2010.03.016
日期:2010.7
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.