CuH-Catalyzed Asymmetric Reduction of α,β-Unsaturated Carboxylic Acids to β-Chiral Aldehydes
作者:Yujing Zhou、Jeffrey S. Bandar、Richard Y. Liu、Stephen L. Buchwald
DOI:10.1021/jacs.7b12260
日期:2018.1.17
The copper hydride (CuH)-catalyzed enantioselective reduction of α,β-unsaturatedcarboxylicacids to saturated aldehydes is reported. This protocol provides a new method to access a variety of β-chiral aldehydes in good yields, with high levels of enantioselectivity and broad functional group tolerance. A reaction pathway involving a ketene intermediate is proposed based on preliminary mechanistic
Enantioselective Redox-Relay Oxidative Heck Arylations of Acyclic Alkenyl Alcohols using Boronic Acids
作者:Tian-Sheng Mei、Erik W. Werner、Alexander J. Burckle、Matthew S. Sigman
DOI:10.1021/ja402916z
日期:2013.5.8
A general, highly selective asymmetric redox-relay oxidative Heck reaction using achiral or racemic acyclic alkenols and boronic acid derivatives is reported. This reaction delivers remotely functionalized arylated carbonyl products from acyclic alkenol substrates, with excellent enantioselectivity under mild conditions, bearing a range of useful functionality. A preliminary mechanistic investigation suggests that the regioselectivity of the initial migratory insertion is highly dependent on the electronic nature of the boronic acid and more subtle electronic effects of the alkenyl alcohol.