<i>N</i>-Methoxyamide: An Alternative Amidation Reagent in the Rhodium(III)-Catalyzed C–H Activation
作者:Chao Zhou、Junqi Zhao、Weicong Guo、Jijun Jiang、Jun Wang
DOI:10.1021/acs.orglett.9b03357
日期:2019.12.6
In the field of transition-metal-catalyzed C-Hactivation, N-methoxyamides are widely used as C-Hactivation substrate. Unexpectedly, in this work N-methoxyamides were found to work as efficient amidation reagents in the rhodium(III)-catalyzedC-Hactivation with boric acid as a cocatalyst. This reaction features broad substrate scope and good yields.
A copper-catalyzed cross-dehydrogenative coupling reaction that involves CâH activation of formamides and NâH activation of N-alkoxy amides has been developed. This protocol affords a novel approach to the synthesis of multisubstituted ureas under mild conditions.
with NBS in toluene was found to conveniently afford the corresponding carboxylicesters, including those bearing a bulky or long-chain substituent, in satisfactory to excellent yields. This approach not only represents a convenient and economic approach to a direct transformation of an alkoxyamide moiety into the carboxylicester functional group, via oxidative homocoupling and the subsequent thermal