Method for Highly Enantioselective Ligation of Two Chiral C(sp3) Stereocenters
摘要:
A method is described for the joining of two alpha-lithiated C(sp(3)) stereocenters efficiently and with retention of configuration. The key step involves the effective removal of two electrons from a chiral organocuprate R2CuLi, by i-propyl 2,4-dinitrobenzoate to form a Cu(III) complex that undergoes at -90 degrees C accelerated reductive elimination enantioselectively and exclusively without the formation of free radicals.
Dieter, R. Karl; Li, ShengJian; Chen, Ningyi, Journal of Organic Chemistry, 2004, vol. 69, # 8, p. 2867 - 2870
作者:Dieter, R. Karl、Li, ShengJian、Chen, Ningyi
DOI:——
日期:——
A new strategy for the stereoselective synthesis of 2,2′-bipyrrolidines
作者:Mary J. Gresser、Paul A. Keller、Steven M. Wales
DOI:10.1016/j.tetlet.2009.06.068
日期:2009.8
A new strategy for the stereoselective synthesis of the 2,2'-bipyrrolidine scaffold is presented using a metathesis reaction followed by asymmetric dihydroxylation for the introduction of the stereogenic elements. This straightforward high-yielding process is suitable for application to the synthesis of additional heterocycles. (C) 2009 Elsevier Ltd. All rights reserved.