4-Alkyl or aryl-3,5-diphenyl-4H-1,2,4-triazoles, 3-phenyl-1,2,4-triazolo[4,3-a]pyridine, and -pyrimidine are obtained by the title reactions. The reaction may proceed via the nucleophilic attack of amidine or imidate on the imidoyl carbon of hydrazonoyl chloride and the subsequent intramolecular cyclization of the intermediate formed in the initial step, with the removal of the amino or alkoxyl and phenylsulfonyl groups.
<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.
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.
The Preparation of 3-Phenyl[1,2,4]triazolo[4,3-<i>a</i>]pyridines and Their Benzologs from<i>N</i>-(Phenylsulfonyl)benzohydrazonoyl Chloride and Pyridines
作者:Suketaka Ito、Akikazu Kakehi、Toshiyuki Matsuno、Jun-ichi Yoshida
DOI:10.1246/bcsj.53.2007
日期:1980.7
3-Phenyl[1,2,4]triazolo[4,3-a]pyridines were obtained in good yields from N′-[α-(1-pyridinio)benzylidene]benzenesulfonohydrazidates, generated from 2-unsubstituted pyridines and N-(phenylsulfonyl)benzohydrazonoyl chloride (2), by oxidation with chloranil. The reaction of quinoline and isoquinoline with 2 gave 1-phenyl-3-phenylsulfonyl-3,3a-dihydro[1,2,4] triazolo [4,3-a]quinoline and 3-phenyl-1-phenylsulfonyl-1
CHARACTERISTIC BEHAVIOR OF<i>N</i>-(PHENYLSULFONYL)BENZOHYDRAZONOYL AZIDE. BASE-INDUCED DECOMPOSITION TO BENZONITRILE AND CYCLIZATION TO A TETRAZOLE
作者:Suketaka Ito、Yumo Tanaka、Akikazu Kakehi
DOI:10.1246/cl.1982.59
日期:1982.1.5
N-(Phenylsulfonyl)benzohydrazonoyl azide decomposed to give benzonitrile on treatment with triethylamine at room temperature, and cyclized to 5-pnenyl-1-(phenylsulfonyl)aminotetrazole on heating in benzene, along with the formation of benzonitrile and other products.