A Simple Resolution Procedure Using the Staudinger Reaction for the Preparation of <i>P</i>-Stereogenic Phosphine Oxides
作者:Neil G. Andersen、Philip D. Ramsden、Daqing Che、Masood Parvez、Brian A. Keay
DOI:10.1021/jo015909u
日期:2001.11.1
(+/-)-P-stereogenic phosphines is achieved by exploiting the Staudinger reaction of a (+/-)-phosphine with enantiopure (1S,2R)-O-(tert-butyldimethylsilyl)isobornyl-10-sulfonyl azide. The resulting mixtures of diastereomeric phosphinimines are generally separable by fractional crystallization or flash chromatography. Subsequent acid-catalyzed hydrolysis provides the corresponding optically pure phosphine oxides
Synthesis, Resolution, and Applications of 2,2‘-Bis(diphenylphosphino)-3,3‘- binaphtho[2,1-<i>b</i>]furan
作者:Neil G. Andersen、Masood Parvez、Brian A. Keay
DOI:10.1021/ol006238+
日期:2000.9.1
A short five-step synthesis of (+/-)-2,2'-bis(diphenylphosphino)-3,3'-binaphtho[2,1-b](BINAPFu, 1) starting from 2-naphthoxyacetic acid is reported. The resolution of BINAPFu 1 was possible using our newly developed resolution procedure for phosphines wherein (1 S)-camphorsulfonyl azide was used to prepare the bisphosphinimine of BINAPFu via the Staundinger reaction. BINAPFu consistently outperformed BINAP in an asymmetric Heck reaction between 2,3 dihydrofuran and phenyl triflate.