Excellent diastereoselectivity (dr value up to 100 : 0) was achieved in DMAP-catalyzed P–N bond formation in the synthesis of P-chirogenic organophosphines from phenylphosphonic dichloride (PhP(O)Cl2) and (S)-2-pyrrolidinemethanol derivatives. Investigations using NMR spectroscopy and calculations revealed the formation of a bimolecular complex from (PhP(O)Cl2) and revealed DMAP as an ‘active phosphonyl’
Chiral phosphinamides: new catalysts for the asymmetric reduction of ketones by borane
作者:Barry Burns、N. Paul King、Heather Tye、John R. Studley、Mark Gamble、Martin Wills
DOI:10.1039/a709174e
日期:——
We have identified a new class of catalysts for the asymmetricreduction of prochiral ketones by borane. Key to the architecture of effective catalysts is an N–PO structural unit which may be part of a phosphinamide, phosphonamide or a related structure. Such catalysts are simple to prepare, are often crystalline solids and may be recovered from reduction reactions and reused. The catalysts act essentially