Preparation of 6-substituted phenanthridines from o-biaryl ketoximes via the Beckmann rearrangement
作者:Kohei Nakamura、Eiji Kobayashi、Katsuhiko Moriyama、Hideo Togo
DOI:10.1016/j.tet.2021.132244
日期:2021.7
Treatment of anti alkyl o-biaryl ketoximes and anti aryl o-biaryl ketoximes with Tf2O at 120 °C, followed by quenching with Et3N gave 6-alkylphenanthridines and 6-arylphenanthridines in good yields, respectively. These reactions proceeded through the O-triflation of the ketoximes, the Beckmann rearrangement, and the electrophilic cyclization of the formed nitrilium group onto the aromatic ring. © 2021
在120°C下用Tf 2 O处理抗烷基邻联芳基酮肟和抗芳基邻联芳基酮肟,然后用Et 3 N猝灭,分别以良好的产率得到6-烷基菲啶和6-芳基菲啶。这些反应通过酮肟的O-三氟甲磺酸化、贝克曼重排和形成的腈基在芳环上的亲电环化进行。© 2021 爱思唯尔科学。版权所有。