申请人:Chan Sun-Chi Albert
公开号:US20050014633A1
公开(公告)日:2005-01-20
The present invention provides compounds of the formula
wherein R is optionally substituted lower alkyl, cycloalkyl or aryl; R′ is alkyl or aryl; n is zero or an integer of 1 or 2; or an enantiomer thereof; or an enantiomeric mixture thereof.
The compounds of formula (I) are bridged C
2
-symmetric biphenyldiphosphine analogs and, thus, may be employed as ligands to generate chiral transition metal catalysts which may be applied in a variety of asymmetric reactions. The compounds of the present invention are easily accessible in high diastereomeric and optical purity according to the methods disclosed herein.
本发明提供了以下公式的化合物,其中R是可选择取代的较低烷基、环烷基或芳基;R′是烷基或芳基;n为零或1或2的整数;或其对映体;或其对映体混合物。公式(I)的化合物是桥接的C2对称的联苯二膦类似物,因此可以作为配体用于生成手性过渡金属催化剂,可应用于各种不对称反应。根据本文所披露的方法,本发明的化合物易于高对映异构和光学纯度地获取。