Modular Synthesis of Novel Chiral Phosphorous Triamides Based on (<i>S</i>)-<i>N</i>-(Pyrrolidin-2-ylmethyl)aniline and Their Application in Asymmetric Catalysis
作者:Katalin Barta、Markus Hölscher、Giancarlo Franciò、Walter Leitner
DOI:10.1002/ejoc.200900477
日期:2009.8
set of new P-chiral phosphorous triamides (PTAs) based on the (S)-N-(pyrrolidin-2-ylmethyl)aniline backbone was prepared by modular synthetic procedures. The chirality at phosphorus can be controlled to a large extent by the synthetic route, and high diastereomeric purities were achieved for most of the reported ligands. This ligand family was evaluated in the copper-catalysed Michael addition of diethylzinc
通过模块化合成程序制备了一组基于 (S)-N-(吡咯烷-2-基甲基)苯胺骨架的新型 P-手性三酰胺 (PTA)。磷的手性可以通过合成路线在很大程度上控制,并且大多数报道的配体都实现了高非对映体纯度。该配体家族在铜催化的二乙基锌与环己-2-烯酮的迈克尔加成中进行了评估,并获得了中等的对映选择性。在不对称镍催化的苯乙烯加氢乙烯基化中,即使在相对较高的反应温度下,使用新的 PTA 配体也能获得良好的转化率和化学选择性,以及高达 60% 的对映选择性。