Direct Nucleophilic Difluoromethylation of Carbonyl Compounds
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 carbonylcompounds under traditional “Wittig reaction conditions” did not give the expected Wittig difluoroolefinated products, but afforded the nucleophilic difluoromethylation products, α-CF2H alcohols. Mechanistic
作者:Chanan D. Sessler、Martin Rahm、Sabine Becker、Jacob M. Goldberg、Fang Wang、Stephen J. Lippard
DOI:10.1021/jacs.7b04457
日期:2017.7.12
unusual hydrogenbonddonor, as confirmed by crystallographic, spectroscopic, and computational methods. Here, we demonstrate the bioisosterism of the OH and CF2H groups and the important roles of CF2–H···O hydrogen bonds in influencing intermolecular interactions and conformational preferences. Experimental evidence, corroborated by theory, reveals the distinctive nature of CF2H hydrogenbonding interactions