Bis(difluoromethyl)trimethylsilicate Anion: A Key Intermediate in Nucleophilic Difluoromethylation of Enolizable Ketones with Me<sub>3</sub>SiCF<sub>2</sub>H
作者:Dingben Chen、Chuanfa Ni、Yanchuan Zhao、Xian Cai、Xinjin Li、Pan Xiao、Jinbo Hu
DOI:10.1002/anie.201605280
日期:2016.10.4
A pentacoordinate bis(difluoromethyl)silicate anion, [Me3Si(CF2H)2]−, is observed for the first time by the activation of Me3SiCF2H with a nucleophilic alkali‐metal salt and 18‐crown‐6. Further study on its reactivity by tuning the countercation effect led to the discovery and development of an efficient, catalytic nucleophilic difluoromethylation of enolizable ketones with Me3SiCF2H by using a combination
通过亲核碱金属盐和18-冠冕-6活化Me 3 SiCF 2 H首次观察到五配位双(二氟甲基)硅酸根阴离子[Me 3 Si(CF 2 H)2 ] -。通过调谐导致与我可烯醇化的酮的高效,催化亲核二氟甲基的发现和开发的抗衡作用在其反应性的进一步研究3 SICF 2通过使用CSF和18-冠-6作为引发体系的组合小时。机理研究表明,[(18-crown-6)Cs] + [Me 3 Si(CF 2 H)2 ]-是该催化反应的关键中间体。