Chiral Frustrated Lewis Pairs Catalyzed Highly Enantioselective Hydrosilylations of Ketones
作者:Xiaoqin Liu、Qiaotian Wang、Caifang Han、Xiangqing Feng、Haifeng Du
DOI:10.1002/cjoc.201900121
日期:2019.7
A highlyenantioselective Piers‐type hydrosilylation of simple ketones was successfully realized using a chiral frustrated Lewis pair of tri‐tert‐butylphosphine and chiral diene‐derived borane as catalyst. A wide range of optically active secondary alcohols were furnished in 80%—99% yields with 81%—97% ee's under mild reaction conditions.
A Modular Assembly of Chiral Oxazolinylcarbene–Rhodium Complexes: Efficient Phosphane-Free Catalysts for the Asymmetric Hydrosilylation of Dialkyl Ketones
作者:Lutz H. Gade、Vincent César、Stéphane Bellemin-Laponnaz
DOI:10.1002/anie.200353133
日期:2004.2.13
31P NMR assays for rapid determination of enantiomeric excess in catalytic hydrosilylations and transfer hydrogenations
作者:Thomas Reiner、Frederik N. Naraschewski、Jörg Eppinger
DOI:10.1016/j.tetasy.2009.01.022
日期:2009.2
Chiral chlorophosphine (S)-(1,1'-binaphthalen-2,2'-dioxy)chlorophosphine (S)-2 was tested for its performance as a chiral-derivatizing agent (CDA) using solutions of various alcohols, amines, and N-BOC amino acids. Based on P-31 NMR spectroscopy, the enantiomeric excess was determined within less than 5 min per sample, reaching an accuracy of +/- 1%. One-pot procedures for a combination of the method with typical homogenous catalytic transformations of prochiral ketones were established. Hydrosilylation products may be analyzed after conversion into alcohols using HF bound to PS-vinyl pyridine co-polymer beads. Transfer hydrogenations simply require solvent evaporation prior to the use of the CDA. (C) 2009 Elsevier Ltd. All rights reserved.