N-Methyl-N-(phenylsulfonyl)benzohydrazonoyl Chloride as a Potential Intermediate for Nitrogen-heterocycles. Preparation of 1-Methyl-3-phenyl-1H-1,2,4-triazoles and -pyrazoles
N-Methyl-N-(phenylsulfonyl)benzohydrazonoyl Chloride as a Potential Intermediate for Nitrogen-heterocycles. Preparation of 1-Methyl-3-phenyl-1H-1,2,4-triazoles and -pyrazoles
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.
<i>N</i>-(Phenylsulfonyl)- and<i>N</i>-Methyl-<i>N</i>-(phenylsulfonyl)benzohydrazonoyl Azides. Thermally Induced Cyclization to Tetrazoles and Decomposition to Benzonitriles
作者:Suketaka Ito、Yumo Tanaka、Akikazu Kakehi
DOI:10.1246/bcsj.57.539
日期:1984.2
N-(Phenylsulfonyl)- and N-methyl-N-(phenylsulfonyl)benzohydrazonoyl azides, prepared from the corresponding hydrazonoyl chlorides and sodium azide, undergo the cyclization to 5-phenyl-1-(phenylsulfonylamino)-1H-tetrazoles together with the competitive decomposition to benzonitriles and the Curtius-type rearrangement leading to semicarbazides when heated in benzene under reflux. The tetrazole formation of hydrazonoyl azides may be characteristic of such hydrazonoyl azides as those carrying an N-sulfonyl substituent, the strong electron-withdrawing nature of which probably promotes the cyclization.
Method for Preparing <i>N</i>-Tosylhydrazonyl Chlorides
作者:Qian Zhang、Siyu Zhang、Meng Tang
DOI:10.1021/acs.joc.2c00191
日期:2022.5.6
A facile and efficient method for preparing N-tosylhydrazonyl chlorides was developed. The reaction was general for a variety of substrates and displayed wonderful compatibility to diverse substituents. A range of N-tosylhydrazonyl chlorides was prepared for the first time.