Diastereoselective Alkynylation of N-p-Tolylsulfinylimines with Aluminum Acetylides
摘要:
The addition of alkynyl dimethyl aluminum compounds onto N-p-tolylsulfinylimines was investigated. The reaction was proved to be totally regioselective, leading to propargylamines with high diastereoselectivity (up to 99% de). Addition of aluminum derivatives gave a reversal of diastereoselectivity compared to the addition reaction of lithium acetylide.
Asymmetric Synthesis of Propargylamides via 3,3‘-Disubstituted Binaphthol-Modified Alkynylboronates
摘要:
Alkynylboronates derived from 3,3'-disubstituted-2,2'-binaphthols react with various N-acylimines to give the expected chiral propargylamides with up to 99% ee. This new methodology was applied to the first enantioselective synthesis of the antitubulin agent (-)-N-acetylcolchinol.
Diastereoselective alkynylation of chiral phosphinoylimines: preparation of optically active propargylamines
作者:Mounira Benamer、Serge Turcaud、Jacques Royer
DOI:10.1016/j.tetlet.2009.11.091
日期:2010.1
Chiral phosphinoylimines were prepared from methylphenylphosphonamides and tested as new chiral and activated imines. The addition of aluminum acetylides was proved to be highly diastereoselective while lithium or magnesium acetylides gave poor results. The cleavage of the chiral auxiliary was done under mild conditions and allows the recovery of the starting phosphonamide without loss of optical purity
Diastereoselective alkynylation of glucose-modified imines with terminal alkynes
作者:Jiangang Mao、Pengfei Zhang
DOI:10.1016/j.tetasy.2009.02.056
日期:2009.3
The copper(I)-catalyzed enantioselective alkynylation of aldimines incorporating a 2,3,4,6-tetrakis-O-pivaloyl-D-glucopyranosyl (Piv(4)Glc) chiral auxiliary with terminal alkynes is reported. The present system provides a versatile tool for the construction of optically active propargylamine derivatives Good. yields and enantiomeric excess values were achieved with an array of imines and biologically active, propargylamine derivatives. (C) 2009 Elsevier Ltd. All rights reserved.
Asymmetric Synthesis of Propargylamides via 3,3‘-Disubstituted Binaphthol-Modified Alkynylboronates
作者:T. Robert Wu、J. Michael Chong
DOI:10.1021/ol0523087
日期:2006.1.1
Alkynylboronates derived from 3,3'-disubstituted-2,2'-binaphthols react with various N-acylimines to give the expected chiral propargylamides with up to 99% ee. This new methodology was applied to the first enantioselective synthesis of the antitubulin agent (-)-N-acetylcolchinol.
Diastereoselective Alkynylation of <i>N</i>-<i>p</i>-Tolylsulfinylimines with Aluminum Acetylides
作者:Serge Turcaud、Farouk Berhal、Jacques Royer
DOI:10.1021/jo071139w
日期:2007.10.1
The addition of alkynyl dimethyl aluminum compounds onto N-p-tolylsulfinylimines was investigated. The reaction was proved to be totally regioselective, leading to propargylamines with high diastereoselectivity (up to 99% de). Addition of aluminum derivatives gave a reversal of diastereoselectivity compared to the addition reaction of lithium acetylide.