One pot synthesis of α-ketoamides from ethylarenes and amines: a metal free difunctionalization strategy
作者:Mani Ramanathan、Chun-Kai Kuo、Shiuh-Tzung Liu
DOI:10.1039/c6ob02361d
日期:——
One-pot and metalfreesynthesis of α-ketoamides has been described through in situ generation of aryl ketones from easily available ethylarenes followed by amidation with various amines. This multiple oxidation protocol involves catalytic I2–pyridine–TBHP (t-butyl hydroperoxide) mediated oxidative benzylic carbonylation and sequential NaI–TBHP mediated oxidative amidation without using any solvent
A novel and efficient I2-promoted oxidative coupling of acetophenes with amines to α-ketoamides is presented, which employs O2 as an environmentally friendly oxidant under metal-free conditions. Based on a series of control experiments and radical trapping experiments, plausible reaction mechanism was proposed and iminium ion was identified as a significant intermediate in this process. This methodology
A two-step continuous synthesis of α-ketoamides and α-amino ketones from 2° benzylic alcohols using hydrogen peroxide as an economic and benign oxidant
A practical two-step synthesis of α-ketoamides and α-amino ketones via direct oxidative coupling between 2° benzylic alcohols and amines was developed. Hydrogen peroxide, an economic and environmentally friendly oxidant, was used, and a metal catalyst was unnecessary. Moreover, the continuous-flow technique was employed to increase the functional group tolerance, efficiency and safety.
A novel synthesis of α-ketoamides from Cu-catalyzed aerobic oxidative C(sp3)–C(sp3) bondcleavage of hydrocinnamaldehydes has been developed. Readily available and environmentally benign oxygen is used as the oxidant. This reaction avoids the use of noble metal catalysts or specialized oxidants, and chemoselectively yields α-ketoamide. Moreover, based on various control experiments, a reasonable mechanism