PROCESS FOR SYNTHESIS OF 2-SUBSTITUTED PYRROLIDINES AND PIPERADINES
申请人:Leleti Rajender Reddy
公开号:US20120302756A1
公开(公告)日:2012-11-29
The present invention provides a highly efficient, versatile one-step process for asymmetric synthesis of either diastereomer of 2-substituted pyrrolidines from a single starting material with excellent yields and high diastereoselectivety. Also provided is a method for the asymmetric synthesis of both diastereomers of 2-substituted piperidines with good yields and excellent diastereoselectivety. Diasteroselectivity is controlled effectively by choice of reducing agent.
[EN] PROCESS FOR SYNTHESIS OF 2-SUBSTITUTED PYRROLIDINES AND PIPERADINES<br/>[FR] PROCÉDÉ DE SYNTHÈSE DE PYRROLIDINES ET DE PIPÉRIDINES SUBSTITUÉES EN POSITION 2
申请人:NOVARTIS AG
公开号:WO2011103263A2
公开(公告)日:2011-08-25
The present invention provides a highly efficient, versatile one-step process for asymmetric synthesis of either diastereomer of 2-substituted pyrrolidines from a single starting material with excellent yields and high diastereoselectivety. Also provided is a method for the asymmetric synthesis of both diastereomers of 2-substituted piperidines with good yields and excellent diastereoselectivety. Diasteroselectivity is controlled effectively by choice of reducing agent.
A Facile Asymmetric Synthesis of Either Enantiomer of 2-Substituted Pyrrolidines
作者:Leleti Rajender Reddy、Sonia G. Das、Yugang Liu、Mahavir Prashad
DOI:10.1021/jo902710s
日期:2010.4.2
A new and general method for asymmetric synthesis of eitherenantiomer of 2-substituted pyrrolidines from a single starting material is described. Reductive cyclization of (SS)-γ-chloro-N-tert-butanesulfinyl ketimines with LiBHEt3 in THF at −78 to 23 °C afforded (SS,R)-N-tert-butanesulfinyl-2-substituted pyrrolidines in excellent yields (88−98%) and with high diastereoselectivity (99:1). The diastereoselectivity