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.
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.