Cationic <i>N</i>-Heterocyclic Carbene Copper-Catalyzed [1,3]-Alkoxy Rearrangement of <i>N-</i>Alkoxyanilines
作者:Itaru Nakamura、Takeru Jo、Yasuhiro Ishida、Hiroki Tashiro、Masahiro Terada
DOI:10.1021/acs.orglett.7b01110
日期:2017.6.16
The [1,3]-alkoxy rearrangement reactions of N-alkoxyanilines were efficiently catalyzed by cationic N-heterocyclic carbene (NHC)-Cu catalysts in affording 2-alkoxyaniline derivatives in good to excellent yields with high functional group compatibility. For N-alkoxyanilines having an electron-withdrawing substituent at the meta-position, the alkoxy group selectively migrated to the more hindered ortho-position
阳离子N-杂环卡宾(NHC)-Cu催化剂可有效催化N-烷氧基苯胺的[1,3]-烷氧基重排反应,从而以高至优异的产率提供具有高官能团相容性的2-烷氧基苯胺衍生物。对于在间位具有吸电子取代基的N-烷氧基苯胺,烷氧基选择性地迁移至更受阻的邻位。相反,对于具有给电子取代基的N-烷氧基苯胺,烷氧基迁移至受阻较少的邻位。机理研究表明,重排反应通过分子内途径进行。