Transition-metal-catalyzed, directed intermolecular C–Hbond functionalization is synthetically useful but heavily underexplored in multiheteroatom heterocycle synthesis. Herein we report a cobalt catalytic method for the formation of a three-nitrogen-bearing benzotriazine scaffold via the coupling of arylhydrazine and oxadiazolone. This synthetic protocol features a low-cost base metal catalyst, a
Base-induced Dehydrosulfinatocyclization of<i>N</i>-Alkyl-<i>N</i>-phenylsulfonyl-<i>N</i>″-arylbenzamidrazones to 3,4-Diaryl-4<i>H</i>-1,2,4-triazoles
作者:Suketaka Ito、Yumo Tanaka、Akikazu Kakehi
DOI:10.1246/bcsj.57.544
日期:1984.2
3,4-Diaryl-4H-1,2,4-triazoles were obtained in good to comparable yields by the reaction of N-alkyl-N-phenylsulfonyl-N″-arylbenzamidrazones with sodium hydride. The reaction probably proceeds via the elimination of benzenesulfinic acid and the oxidative cyclization of N-alkylidene-N″-arylbenzamidrazones generated by the base-catalyzed isomerization of azo intermediates.
Copper-Catalyzed Domino Reaction of 2-Haloanilines with Hydrazides: A New Route for the Synthesis of Benzo[e][1,2,4]triazine Derivatives
作者:Guosheng Huang、Han Guo、Jin Liu、Xianxue Wang
DOI:10.1055/s-0031-1290615
日期:2012.4
A copper-catalyzed domino reaction for the synthesis of benzo[e][1,2,4]triazine derivatives has been developed using readily available substituted 2-haloanilines and hydrazides as the starting materials. The procedure of the present method is mild, facile, and efficient.
A Novel Synthesis of 3-Aryl-1,2,4-benzotriazines<i>via</i><i>N</i>-Phenylsulfonyl-<i>N</i>″-arylbenzamidrazones
作者:Suketaka Ito、Yumo Tanaka、Akikazu Kakehi
DOI:10.1246/bcsj.55.859
日期:1982.3
3-Aryl-1,2,4-benzotriazines were obtained in good yields by the mercury(II) oxide-oxidation of N-phenylsulfonyl-N″-arylbenzamidrazones prepared from N-(phenylsulfonyl)benzohydrazonoyl chlorides and anilines. From the synthetic viewpoint for benzotriazines, this method may be of high utility on account of the availability of starting materials and higher yields.