Versatile Iridicycle Catalysts for Highly Efficient and Chemoselective Transfer Hydrogenation of Carbonyl Compounds in Water
作者:Dinesh Talwar、Xiaofeng Wu、Ourida Saidi、Noemí Poyatos Salguero、Jianliang Xiao
DOI:10.1002/chem.201403701
日期:2014.9.26
Cyclometalated iridium complexes are shown to be highly efficient and chemoselective catalysts for the transfer hydrogenation of a wide range of carbonyl groups with formic acid in water. Examples include α‐substituted ketones (α‐ether, α‐halo, α‐hydroxy, α‐amino, α‐nitrile or α‐ester), α‐keto esters, β‐keto esters and α,β‐unsaturated aldehydes. The reduction was carried out at substrate/catalyst ratios of
环金属化铱配合物被证明是高效的化学选择催化剂,可用于在水中用甲酸转移多种羰基的加氢反应。实例包括α-取代的酮(α-醚,α-卤代,α-羟基,α-氨基,α-腈或α-酯),α-酮酸酯,β-酮酸酯和α,β-不饱和醛。在pH 4.5下,还原反应的底物/催化剂比例最高为50000,并且不需要有机溶剂。该方案为合成β-官能化的仲醇(例如β-羟基醚,β-羟胺和β-羟基卤化物)提供了一种实用,简便且有效的方法,它们是医药,精细化工,香料和农业化学合成中的重要中间体。