Copper-Catalyzed Reaction of Trifluoromethylketones with Aldehydes via a Copper Difluoroenolate
作者:Ryohei Doi、Masato Ohashi、Sensuke Ogoshi
DOI:10.1002/anie.201508266
日期:2016.1.4
A copper‐catalyzed reaction of easily accessible α,α,α‐trifluoromethylketones with various aldehydes affords difluoro‐methylene compounds in the presence of diboron and NaOtBu. The key process of the reaction is the formation of a copper difluoroenolate by 1,2‐addition of a borylcopper intermediate to α,α,α‐trifluoromethylketones and subsequent β‐fluoride elimination. Mechanistic studies including
易催化的α,α,α-三氟甲基酮与各种醛的铜催化反应在存在二硼和NaO t Bu的情况下提供了二氟亚甲基化合物。该反应的关键过程是通过向α,α,α-三氟甲基酮中添加1,2硼基铜中间体并随后消除β-氟来形成二氟烯酸铜。还描述了包括可能的阴离子醇铜中间体的分离和表征在内的机理研究。