the biologically important 1,4-benzodiazepine skeleton were conveniently constructed from 2-(arylamino)benzamides through PhI(OAc)2-mediated oxidative C–N bond formation. The attractive features of this new synthetic strategy include mild reaction conditions, the heavy-metal-free characteristic of the oxidative coupling process, and the flexibility to tolerate a broad scope of substrates.
NIS-mediated intramolecular oxidative α-functionalization of tertiary amines: transition metal-free synthesis of 1,2-dihydro-(4H)-3,1-benzoxazin-4-one derivatives
作者:Le Liu、Liang Du、Daisy Zhang-Negrerie、Yunfei Du
DOI:10.1039/c5ra03882k
日期:——
A novel method for direct α-functionalization of tertiary aminesviaNIS-mediated oxidative C–O bond formation, where NIS serves as both an oxidant and an iodination reagent, has been developed.
A controllable palladium-catalyzed intramolecular C–H activation of N-alkyl-N-arylanthranilic acids has been developed. The methodology allows selective synthesis of 1,2-dihydro-(4H)-3,1-benzoxazin-4-ones and carbazoles from the same starting materials and palladium catalyst. The selectivity is controlled by the oxidant. Silver oxide promotes C(sp3)–H activation/C–O cyclization to provide 1,2-dihydro-(4H)-3
Redox-neutral decarboxylative photocyclization of anthranilic acids
作者:Huawen Huang、Kun Deng、Guo-Jun Deng
DOI:10.1039/d0gc02789h
日期:——
photoredox neutral system has been found to efficiently enable intramolecular decarboxylative cyclization of anthranilicacids. This facile protocol provides an alternative method for the synthesis of carbazoles. Mechanistic studies reveal a key photoinduced 6π-electrocyclization process and formic acid was released as the sole byproduct.