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.
Utilization of Lithium Amide in the Synthesis of <i>N</i>-Arylanthranilic Acids and <i>N</i>-Arylanthranilamides
作者:Edward M. Davis、Thomas N. Nanninga、Howie I. Tjiong、Derick D. Winkle
DOI:10.1021/op0501242
日期:2005.11.1
N-arylanthranilamides was developed. Lithium amide promoted coupling of anilines with 2-fluorobenzoic acids or 2-fluorobenzamides lead to the desired compounds in good yield. Both primary and N-substitutedanilines were effective partners for the reaction. In the reaction of 2,3,4-trifluorobenzoic acid with various anilines, selectivity for ortho substitution was observed exclusively.
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.