申请人:IMAMOTO Tsuneo
公开号:US20090030231A1
公开(公告)日:2009-01-29
Disclosed is a process of preparing an optically active β-hydroxycarboxylic acid derivative comprising asymmetrically hydrogenating a β-keto compound in the presence of a catalyst comprising a transition metal complex compound having a 2,3-bis(dialkylphosphino)pyrazine derivative as a ligand. The pyrazine derivative is preferably a quinoxaline derivative, and the transition metal is preferably ruthenium. Preferred examples of the quinoxaline derivative are (S,S)-2,3-bis(tert-butylmethylphosphino)quinoxaline, (R,R)-bis(tert-butylmethylphosphino)quinoxaline, (S,S)-bis(tert-adamantylmethylphosphino)quinoxaline, and (R,R)-bis(adamantylmethylphosphino)quinoxaline.
本文揭示了一种制备光学活性β-羟基羧酸衍生物的过程,包括在存在以2,3-双(二烷基膦基)吡唑衍生物为配体的过渡金属配合物催化剂的情况下,对β-酮化合物进行不对称氢化。吡唑衍生物最好是喹啉衍生物,过渡金属最好是钌。喹啉衍生物的首选示例包括(S,S)-2,3-双(叔丁基甲基膦基)喹啉、(R,R)-双(叔丁基甲基膦基)喹啉、(S,S)-双(叔金刚烷基甲基膦基)喹啉和(R,R)-双(金刚烷基甲基膦基)喹啉。