Copper(II)-Catalyzed Hydrosilylation of Ketones Using Chiral Dipyridylphosphane Ligands: Highly Enantioselective Synthesis of Valuable Alcohols
作者:Feng Yu、Ji-Ning Zhou、Xi-Chang Zhang、Yao-Zong Sui、Fei-Fei Wu、Lin-Jie Xie、Albert S. C. Chan、Jing Wu
DOI:10.1002/chem.201102157
日期:2011.12.9
also allowed the hydrosilylation of a diverse spectrum of alkyl aryl ketones with excellent enantioselectivities (up to 98 % ee) and exceedingly high turn‐over rates (up to 50 000 S/L molar ratio in 50 min reaction time) in air, under very mild conditions, which offers great opportunities for the preparation of various physiologically active targets. The synthetic utility of the chiral products obtained
在PhSiH的存在3作为还原剂,对映异构dipyridylphosphane配体和Cu的组合(OAC)2 ⋅ ħ 2 O,这是一种易于处理和价廉的铜盐,导致了显着的实际和通用的手性催化剂系统。通过底物与配体的摩尔比(S / L)实现了对立体纯度高的对映体(高达99.9%对映体过量(ee))的一些合成有趣的β-,γ-或δ-卤代醇的立体选择性形成)最高可达10000。本方案还允许对多种光谱的烷基芳基酮进行氢化硅烷化,并具有出色的对映选择性(可达98% ee))且在非常温和的条件下在空气中具有极高的周转率(在50分钟的反应时间内达到50,000 S / L的摩尔比),这为制备各种具有生理活性的靶标提供了巨大的机会。通过将光学富集的β-卤代醇分别有效地转化为相应的氧化苯乙烯,β-氨基醇和β-叠氮基醇,突出了所获得的手性产物的合成效用。