Efficient Difluoromethylation of Alcohols Using TMSCF<sub>2</sub>Br as a Unique and Practical Difluorocarbene Reagent under Mild Conditions
作者:Qiqiang Xie、Chuanfa Ni、Rongyi Zhang、Lingchun Li、Jian Rong、Jinbo Hu
DOI:10.1002/anie.201611823
日期:2017.3.13
difluoromethylation of alcohols using commercially available TMSCF2Br (TMS=trimethylsilyl) as a unique and practical difluorocarbene source is developed. This method allows primary, secondary, and even tertiary alkyl difluoromethyl ethers to be synthesized under weakly basic or acidic conditions. The reaction mainly proceeds through the direct interaction between a neutral alcohol and difluorocarbene
Direct Difluoromethylation of Alcohols with an Electrophilic Difluoromethylated Sulfonium Ylide
作者:Jiansheng Zhu、Yafei Liu、Qilong Shen
DOI:10.1002/anie.201603166
日期:2016.7.25
mild reaction conditions and with good functional‐group tolerance was developed. The development of the method was based on the invention of a stable, electrophilic, difluoromethylating reagent, difluoromethyl‐(4‐nitrophenyl)‐bis(carbomethoxy) methylide sulfonium ylide, which was synthesized by reaction of the easily available 4‐nitrophenyl (difluoromethyl)thioether and dimethyl diazomalonate in the
Difluoromethylation of alcohols with TMSCF2Br in water: A new insight into the generation and reactions of difluorocarbene in a two-phase system
作者:Rongyi Zhang、Chuanfa Ni、Qiqiang Xie、Jinbo Hu
DOI:10.1016/j.tet.2020.131676
日期:2020.12
ved reactions can be performed in the presence of water, the reaction of difluorocarbene using water as the only reaction medium is rare. By using TMSCF2Br as a unique difluorocarbene reagent and KHF2 as a mild activator, the difluoromethylation of liquid alcohols in water is described. This research not only develops an environmentally benign process for the synthesis of difluoromethyl ethers, but