作者:Zuyong Deng、Jin-Hong Lin、Ji Cai、Ji-Chang Xiao
DOI:10.1021/acs.orglett.6b01425
日期:2016.7.1
Phosphonium salt ([Ph3P+CF2H] Br–, DFPB) was found to be an efficient nucleophilic difluoromethylation reagent. Although DFPB is known as a phosphonium ylide precursor, its reaction with carbonyl compounds under traditional “Wittig reaction conditions” did not give the expected Wittig difluoroolefinated products, but afforded the nucleophilic difluoromethylation products, α-CF2H alcohols. Mechanistic
发现os盐([Ph 3 P + CF 2 H] Br –,DFPB)是一种有效的亲核二氟甲基化试剂。虽然DFPB称为鏻叶立德前体,它与传统的“维悌希反应条件”下的羰基化合物反应不产生预期的维悌希difluoroolefinated产品,但所提供的亲核二氟甲基产品,α-CF 2 ħ醇。机理研究表明,意外的转化是通过CF 2 H基团的直接转移进行的,这是由于高P-O亲和力引起的。