Reductive Cleavage of C(sp<sup>2</sup>)–CF<sub>3</sub> Bonds in Trifluoromethylpyridines
作者:Piers St. Onge、Shajia I. Khan、Adam Cook、Stephen G. Newman
DOI:10.1021/acs.orglett.3c00258
日期:2023.2.17
of an earth-abundant alkoxide base and silicon hydride species. A variety of pyridine and quinoline substrates bearing alkyl, aryl, and amino functional groups are reduced in moderate to high yields. The reaction is chemoselective for C(sp2)–CF3 groups located at the 2-position on the pyridine ring, leaving trifluoromethyl groups located elsewhere on the molecule intact. Preliminary mechanistic studies
利用地球上丰富的醇盐碱和氢化硅物种开发了还原性脱三氟甲基化方案。各种带有烷基、芳基和氨基官能团的吡啶和喹啉底物以中等到高产率被还原。该反应对位于吡啶环 2 位的C(sp 2 )–CF 3基团具有化学选择性,使位于分子其他位置的三氟甲基完好无损。初步的机理研究表明,硅烷和碱的结合产生了一个强还原系统,可以将电子转移到缺电子的 π 系统。