A process for the enantioselective reduction of prochiral ketones to chiral alcohols by (a) the reaction of a prochiral ketone with a silane agent, which is present in a stoichiometric quantity, in the presence of a catalyst derived from a Zn, Co or Cd precursor compound and from a chiral amine, imine, alcohol or amino alcohol ligand; (b) the hydrolysis of the siloxane obtained using an appropriate agent; and (c) the separation and purification of the optically active alcohol formed. Polymethylhydrosiloxane (PMHS) is a preferred silane agent, zinc is a preferred metal, and the precursor compound is produced by reacting a salt or complex of the respective metal with the reducing agent. In another embodiment, an appropriate salt of the chosen metal is used directly in the reaction with the chiral ligand to produce the catalytic form after reaction with the ligand. The process enables high enantiomeric excesses (ee) to be obtained in chiral alcohols.
一种对于非手性酮进行对映选择性还原成手性醇的方法,包括以下步骤:(a)在
锌、
钴或
镉前体化合物和手性胺、
亚胺、醇或
氨基醇
配体的催化剂存在下,将非手性酮与
硅烷试剂按
化学计量比反应;(b)使用适当试剂
水解得到
硅氧烷;(c)分离和纯化所得到的对映光学活性醇。聚甲基氢
硅氧烷(PMHS)是一种优选的
硅烷试剂,
锌是一种优选的
金属,前体化合物是通过将相应
金属的盐或配合物与还原剂反应得到的。在另一种实施方式中,所选
金属的适当盐直接与手性
配体反应,以在反应后形成催化形式。该方法可使手性醇获得高对映体过量(ee)。