Mechanochemical Synthesis of N‐Aryl Amides from O‐Protected Hydroxamic Acids
作者:Emmanouil Broumidis、Mary C. Jones、Filipe Vilela、Gareth O. Lloyd
DOI:10.1002/cplu.202000451
日期:2020.8
protocols for the synthesis of an array of N‐arylamides have been developed. This was achieved by a C−N cross‐coupling between O‐pivaloyl hydroxamicacids and aryl iodides or aryl boronic acids, in the presence of a stoichiometric amount of a copper mediator. The effectiveness of this method is highlighted by the high‐yielding (up to 94 %), scalable (up to 8 mmol), and rapid (20 minutes) synthesis of N‐aryl
We report a fundamental mechanistic study of photoinduced Ir-nitrenoid formation and inner-sphere group transposition reactivity using Ir-hydroxamates. By preparing thermally stable yet photoactive Ir-hydroxamates, we explored the amidative aryl migration. Experimental studies, femtosecond transient absorption, and computations revealed the mechanism of photoactivation, N−O cleavage, Ir-nitrenoid formation
Rh(III)-Catalyzed Cascade Oxidative Olefination/Cyclization of Picolinamides and Alkenes via C–H Activation
作者:Shangjun Cai、Chao Chen、Peng Shao、Chanjuan Xi
DOI:10.1021/ol501275r
日期:2014.6.6
Rh(III)-catalyzed cascade oxidative alkenylation/cyclization of picolinamides and alkenes to furnish pyrido pyrrolone derivatives is described, in which three C-H bonds and one N-H bond broke, while one C-C bond and one C-N bond formed. The reaction proceeded with high yield and high regioselectivity and stereoselectivity. Moreover, copper acetate can also be used in catalytic amounts with O-2 serving as the terminal oxidant.