Rh/SPO-WudaPhos-Catalyzed Asymmetric Hydrogenation of α-Substituted Ethenylphosphonic Acids via Noncovalent Ion-Pair Interaction
作者:Xuguang Yin、Caiyou Chen、Xiong Li、Xiu-Qin Dong、Xumu Zhang
DOI:10.1021/acs.orglett.7b02098
日期:2017.8.18
(SPO-Wudaphos) through noncovalent ion-pair interaction between the substrate and catalyst under mild reaction conditions without base. A series of chiral phosphonic acids were obtained with excellent results (up to 98% ee, >99% conversion, 2000 TON). Moreover, the control experiments showed that the noncovalent ion-pair interaction was critical in this asymmetric hydrogenation.
Rh /二茂铁基手性双磷配体(SPO-Wudaphos)已在温和的反应条件下,在无碱的条件下,通过底物与催化剂之间的非共价离子对相互作用成功地实现了Rh /二茂铁基手性双磷配体(SPO-Wudaphos)的α-取代乙烯基膦酸的不对称氢化。获得了一系列具有优异结果的手性膦酸(高达98%ee,> 99%的转化率,2000 TON)。此外,对照实验表明,非共价离子对相互作用在这种不对称氢化中至关重要。