Asymmetric synthesis of di- and trisubstituted pyrrolidinones via zirconium-mediated intramolecular coupling of N-3-alkenyl carbamates
摘要:
N-3-Alkenyl carbamates, which are readily available in enantiomerically pure form, undergo a stereoselective intramolecular coupling under the effect of a Cp2ZrCl2/2n-BuLi reagent. The influence of the carbamate structure on the stereoselectivity was tested. The reaction gives an easy access to various di-and trisubstituted enantiopure pyrrolidinones. (c) 2007 Elsevier Ltd. All rights reserved.
Asymmetric synthesis of di- and trisubstituted pyrrolidinones via zirconium-mediated intramolecular coupling of N-3-alkenyl carbamates
摘要:
N-3-Alkenyl carbamates, which are readily available in enantiomerically pure form, undergo a stereoselective intramolecular coupling under the effect of a Cp2ZrCl2/2n-BuLi reagent. The influence of the carbamate structure on the stereoselectivity was tested. The reaction gives an easy access to various di-and trisubstituted enantiopure pyrrolidinones. (c) 2007 Elsevier Ltd. All rights reserved.
Diastereoselective Access to Enantiomerically Pure cis-2,3-Disubstituted Pyrrolidines
作者:Pierre-Olivier Delaye、Tarun K. Pradhan、Émilie Lambert、Jean-Luc Vasse、Jan Szymoniak
DOI:10.1002/ejoc.201000255
日期:——
3-disubstituted pyrrolidines is reported that involves diastereoselective allylation of (R)-phenylglycinol-derived imines and a sequential hydrozirconation-cyclization. A number of pyrrolidine derivatives bearing aryl, heteroaryl, alkyl and alkenyl groups have been prepared in this way. Such compounds are useful buildingblocks in the synthesis of molecules of biological interest, as illustrated by