Electrochemicalreduction of 2-bromo-carboxamides involves self-protonation of the electrogenerated bases and affords, among other products, cyclo-adducts incorporating a dimethylformamide unit.
Remote Nucleophilic Substitution at a C(sp<sup>3</sup>)–H Bond of α-Bromocarboxamides via 1,4-Hydrogen Atom Transfer To Access <i>N</i>-Acyl-<i>N</i>,<i>O</i>-acetal Compounds
作者:Daisuke Shimizu、Ayako Kurose、Takashi Nishikata
DOI:10.1021/acs.orglett.2c02716
日期:2022.11.4
Herein, we report a remote nucleophilicsubstitution reaction via 1,4-hydrogen atom transfer (1,4-HAT) to synthesize N-acyl-N,O-acetal moieties. α-Bromocarboxamide undergoes rSN at a C(sp3)–H bond in the presence of an alcohol/phenol and a copper catalyst. Mechanistic studies using deuterated α-bromocarboxamide confirmed that the 1,4-HAT process is the rate-determining step. Topologically complex N-acyl-N