作者:Dmitry Katayev、Benjamin Exner、Lukas J. Gooßen
DOI:10.1002/cctc.201500068
日期:2015.7.13
A trimetallic palladium/copper/silver system has been developed that allows the decarboxylative Hiyama coupling of ortho‐substituted aryl carboxylates with trialkoxyarylsilanes to give the corresponding biaryls. The cross‐coupling is catalyzed by a Pd/N‐heterocyclic carbene complex with silver carbonate aiding its reoxidation. Copper(II) fluoride acts as decarboxylation catalyst, stoichiometric oxidant
已经开发了三金属钯/铜/银系统,该系统允许邻位取代的芳基羧酸盐与三烷氧基芳基硅烷进行脱羧Hiyama偶联,得到相应的联芳基。Pd / N-杂环卡宾配合物与碳酸银协助其再氧化,从而催化交叉偶联。氟化铜(II)用作脱羧催化剂,化学计量的氧化剂和氟化物源。该协议的范围由22个实例证明,其中卤化芳基适合进一步偶联,并且产品的合成用途通过将其转化为咔唑和1 H-吲唑来说明。