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.
Method for Highly Enantioselective Ligation of Two Chiral C(sp<sup>3</sup>) Stereocenters
作者:Eswar Bhimireddy、E. J. Corey
DOI:10.1021/jacs.7b07366
日期:2017.8.16
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.
New convenient, enantiospecific synthesis of (S,S)- and (R,R)-2,2′-bipyrrolidine derivatives
An enantiomeric pair of (S,S)- and (R,R)-bipyrrolidine derivatives has been prepared from D- and L-tartaric acids or D-mannitol as opticallyactive starting materials. Taking advantage of the C2-symmetric nature of these chiral sources, the synthetic sequence has been established by using efficient side chain elongation, stereospecific conversion of a vicinal diol into a diazido group via SN2 inversion
(S,S)-和(R,R)-联吡咯烷衍生物的对映体对是由D-和L-酒石酸或D-甘露糖醇作为旋光起始原料制备的。利用这些手性来源的C 2对称性质,通过使用有效的侧链延伸,通过S N 2转化将邻二元醇立体定向转化为重氮基团和通过分子内取代形成吡咯烷环,从而建立了合成序列作为关键步骤。