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 asymmetric reduction 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
我们已经鉴定出一类新的催化剂,用于硼烷不对称还原前手性酮。有效催化剂结构的关键是N–P O结构单元,它可能是次膦酰胺,膦酰胺或相关结构的一部分。这种催化剂易于制备,通常为结晶固体,可以从还原反应中回收并再利用。催化剂基本上起路易斯碱的作用,通过给电子增加硼烷的反应性。在与硼烷反应时,将羟基引入催化剂中提供了相邻的路易斯酸位点,因此提供了能够不对称引发高达92%ee的优异催化剂。