New hexa-coordinate iron (II) complexes comprising compounds of formula (I) are described. These compounds comprise a tetradentate ligand with donor atoms comprising nitrogen and phosphorus. These complexes are shown for the first time to be useful catalysts for the hydrogenation of ketones, aldehydes, or imines to produce alcohols or amines, and the asymmetric hydrogenation of prochiral ketones or imines to produce non-racemic alcohols or amines. The source of the hydrogen can be hydrogen gas or a hydrogen-donating molecule such as isopropanol or hydrogen-donating mixture such as formic acid and an amine depending on the structure of the catalyst. In certain embodiments, the axial ligands on the catalyst comprise organonitrile ligands, carbonyl ligands, isonitrile ligands, or combinations thereof. The catalysts and the preparation thereof are disclosed. A reaction using phosphine and diamine precursors that is templated by the iron ion is the preferred route to the catalysts.
本文介绍了一种由化合物I式组成的新型六配位
铁(II)配合物。这些化合物包含一个四齿
配体,其供体原子包括氮和
磷。首次展示这些配合物可用作催化剂,用于酮、醛或
亚胺的加氢反应,产生醇或胺,以及手性加氢反应,用于产生非对映体的醇或胺。
氢气或氢供体分子(如
异丙醇)或氢供体混合物(如
甲酸和胺)可作为氢源,具体取决于催化剂的结构。在某些实施例中,催化剂上的轴向
配体包括有机腈
配体、羰基
配体、异腈
配体或其组合。本文还介绍了催化剂及其制备方法。通过
铁离子模板引导的膦和二胺前体反应是制备催化剂的首选途径。