Difluorocarbene‐Induced Ring‐Opening Difluoromethylation‐Halogenation of Cyclic (Thio)Ethers with TMSCF
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X (X=Br, Cl)**
作者:Rongyi Zhang、Qigang Li、Qiqiang Xie、Chuanfa Ni、Jinbo Hu
DOI:10.1002/chem.202103428
日期:2021.12.20
protonation of difluromethylene oxonium or sulfonium ylides (generated from diflurorocarbene and cyclic (thio)ethers) constitutes the formal activation of C−O/S bond of (thio)ethers with difluormethyl cation, thus facilitating the ring-opening difluoromethylation-halogenation of cyclic (thio)ethers. (TMS=trimethylsilyl).
An efficient reduction followed by cyclization of diacid compounds with the InBr3/TMDS system is reported. This system allows the formation of five- and six-membered ring ethers substituted in the 3- or 4-position.