A Novel Resolution Procedure for the Preparation of P-Stereogenic Phosphine Oxides
摘要:
[GRAPHICS]A new general route for preparing enantiomerically pure P-stereogenic phosphine oxides has been developed by exploiting the Staudinger reaction between racemic tertiary phosphines and an enantiomerically pure organoazide. The resulting phosphinimines are easily resolved by either crystallization or flash chromatography and serve as synthetic intermediates toward enantiomerically pure phosphine oxides.
A Novel Resolution Procedure for the Preparation of P-Stereogenic Phosphine Oxides
摘要:
[GRAPHICS]A new general route for preparing enantiomerically pure P-stereogenic phosphine oxides has been developed by exploiting the Staudinger reaction between racemic tertiary phosphines and an enantiomerically pure organoazide. The resulting phosphinimines are easily resolved by either crystallization or flash chromatography and serve as synthetic intermediates toward enantiomerically pure phosphine oxides.
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