The invention pertains to a process for the preparation of an amine having at least two chiral centers from a ketone having a chiral center at the a position and an amine comprising the steps of: (a) contacting a ketone having a chiral center at the a position and a primary amine thereby forming an imine; (b) contacting the imine with a reducing agent in the presence of an enantioselective catalyst to form an amine having at least two chiral centers, wherein step (a) and/or step (b) are conducted under racemization-enhancing conditions, wherein the racemization-enhancing conditions are achieved by addition of an acid and/or by addition of a salt of a primary amine and an acid, which salt is added in addition to or instead of the primary amine, and wherein the reducing agent is hydrogen.
该发明涉及一种从具有手性中心的酮和胺制备至少具有两个手性中心的胺的过程,包括以下步骤:(a)将具有手性中心的酮和一种一级胺接触以形成
亚胺;(b)在手性选择性催化剂存在下将
亚胺与还原剂接触以形成至少具有两个手性中心的胺,其中步骤(a)和/或步骤(b)在增强消旋化条件下进行,增强消旋化条件通过添加酸和/或添加一种一级胺和酸的盐来实现,该盐可以添加到一级胺之外或代替一级胺,还要求还原剂为氢。