Carbon–Carbon Bond Formation of Trifluoroacetyl Amides with Grignard Reagents via C(O)–CF<sub>3</sub> Bond Cleavage
作者:Longzhi Zhu、Liyuan Le、Mingpan Yan、Chak-Tong Au、Renhua Qiu、Nobuaki Kambe
DOI:10.1021/acs.joc.9b00583
日期:2019.5.3
The reaction of trifluoroacetyl amides with Grignard reagent for the substitution of CF3 group with various alkyl or aryl groups is described. A variety of aryl, quinolin-8-yl, and (hetero)alkyl functional groups as well as F, Cl, and Br atoms are well tolerated. These moisture-stable and easily available trifluoroacetyl amides can be conveniently obtained and used as new versatile precursors for isocyanates
描述了三氟乙酰酰胺与格氏试剂的反应,以用各种烷基或芳基取代CF 3基团。各种芳基,喹啉-8-基和(杂)烷基官能团以及F,Cl和Br原子均具有良好的耐受性。这些水分稳定且易于获得的三氟乙酰基酰胺可以方便地获得,并用作异氰酸酯的新型通用前体。对照实验表明,反应是通过异氰酸酯中间体和/或醇盐/酰胺双阴离子中间体进行的。