One-step synthesis of novel 2,2′-bi(4,5-dihydro-1,3,4-thiadiazole) and 2,3-disubstituted 1,4-benzothiazine derivatives
作者:Ahmad M. Farag、Ahmad S. Shawali、Mohamad S. Algharib、Kamal M. Dawood
DOI:10.1016/s0040-4020(01)90419-3
日期:1994.4
unkown bi-4,5-dihydrothiadiazol-5-imine derivatives 5. Reaction of 5 with acetic anhydride, benzoyl chloride and nitrous acid yield N-acetyl, N-benzoyl and N-nitroso derivatives 7, 8 and 9, respectively. Thermolysis of 9 afforded the bi-4,5-dihydrothiadiazol-5-ones 10. The dihalides 2 react also with 2-aminothiophenol to afford the 1,4-benzothiazine derivatives 11 which upon oxidation gave 12.
N,N'-二芳基草酰二氢偶氮酰二卤化物2与硫氰酸钾或硫脲反应,生成迄今未知的bi-4,5-dihydrothiadiazol-5-imine衍生物5。的反应5与乙酸酐,苯甲酰氯和亚硝酸收率的N-乙酰基,N-苯甲酰基和N-亚硝基衍生物7,8和9分别。热分解9得到双-4,5- dihydrothiadiazol -5-酮10。二卤化物2也与2-氨基硫酚反应,得到1,4-苯并噻嗪衍生物11,该衍生物在氧化后得到12。