Copper(II)-Mediated Aerobic Oxidation of Benzylimidates: Synthesis of Primary α-Ketoamides
作者:Yogesh Kumar、Mukta Shaw、Rima Thakur、Amit Kumar
DOI:10.1021/acs.joc.6b01262
日期:2016.8.5
A simple and straightforward method for the synthesis of primary α-ketoamides has been discovered. The reaction represents the first example of benzylimidates directly converting to primary α-ketoamides by using sustainable molecular oxygen as an oxidant. This reaction proceeds in the presence of copper(II) salt via cleavage of benzylic C–H and C–O bonds of the benzylimidates with liberation of alcohols
A highly efficient molecular iodine catalyzed oxidative amidation of aryl methyl ketones has been developed. This reaction represents a novel strategy for the synthesis of free (N–H) α-ketoamides.
denitrogenation/oxidation reaction for the preparation of primary α-ketoamides was developed using α-azido ketones as a substrate and TEMPO as an oxidant. α-Azido ketones were denitrogenated in situ to form an imino ketone intermediate, which underwent a radical addition process and radical migration to form α-ketoamides. It is worth noting that the imino ketone intermediate is the key to this reaction.
以 α-叠氮基酮为底物,TEMPO 为氧化剂,开发了铜 (II) 促进的脱氮/氧化反应,用于制备初级 α-酮酰胺。α-叠氮基酮原位脱氮形成亚氨基酮中间体,其经过自由基加成过程和自由基迁移形成α-酮酰胺。值得注意的是,亚氨基酮中间体是该反应的关键。