The present invention relates to a process for the hydrogenation of imines with hydrogen in the presence of iridium catalysts. In particular the present invention relates to a process for the hydrogenation of imines with hydrogen under elevated pressure in the presence of an iridium catalysts and with or without an inert solvent, wherein the reaction mixture comprises a phosphonium chloride, bromide or iodide in the presence or in the absence of an acid, which can be an organic or inorganic acid, soluble or insoluble in the reaction mixture. Suitable imines are especially those that contain at least one (Formula I) group. If the groups are substituted asymmetrically and are thus compounds having a prochiral ketimine group, it is possible in the process according to the invention for mixtures of optical isomers or pure optical isomers to be formed if enantioselective or diastereoselective iridium catalysts are used.
本发明涉及一种在
铱催化剂存在下使用
氢气对
亚胺进行氢化的方法。特别地,本发明涉及一种在
铱催化剂存在下,使用
氢气在高压条件下对
亚胺进行氢化的方法,该方法可以使用惰性溶剂或不使用惰性溶剂,反应混合物包含一种
氯化膦、
溴化膦或
碘化膦,存在或不存在有机或
无机酸,该酸在反应混合物中可溶或不溶。适用的
亚胺特别是那些至少含有一个(公式I)基团的
亚胺。如果基团不对称取代,因此是具有可控手性的酮
亚胺基团的化合物,则可以在使用对映选择性或对映异构选择性
铱催化剂的情况下形成光学异构体混合物或纯光学异构体。