Transition‐Metal‐Free Controllable Single and Double Difluoromethylene Formal Insertions into C−H Bonds of Aldehydes with TMSCF
<sub>2</sub>
Br
作者:An Liu、Chuanfa Ni、Qiqiang Xie、Jinbo Hu
DOI:10.1002/anie.202217088
日期:2023.2.6
The unprecedented controllable single and double difluoromethylene (CF2) formal insertions into C−H bonds of aldehydes under transition-metal-free conditions with nearly full selectivity has been achieved, in which the well-defined formation of 2,2-difluoroenolsilyl ether and 2,2,3,3-tetrafluorocyclopropanolsilyl ether intermediates using difluorocarbene reagent TMSCF2Br (TMS=trimethylsilyl) is the
在无过渡金属的条件下,实现了前所未有的可控单二氟亚甲基和双二氟亚甲基 (CF 2 ) 形式插入醛的 C-H 键,几乎完全选择性,其中明确形成 2,2-二氟烯醇甲硅烷基醚和2,2,3,3-四氟环丙醇甲硅烷基醚中间体使用二氟卡宾试剂TMSCF 2 Br (TMS=trimethylsilyl)是成功的关键。