Facile synthesis of thiadiazolo [2,3-b] quinazoline derivatives via the Japp-Klingemann Reaction
作者:Abdou O. Abdelhamid、Hamdi M. Hassaneen、Ikhlass M. Abbas、Ahmad S. Shawali
DOI:10.1016/0040-4020(82)80243-3
日期:1982.1
Diazotized anathranilic acid and its methyl ester react with substituted α-thiocyanatoacetoacetanilides3a–c to give in both cases the corresponding thiadiazolo [2,3-b] quinazolines6a–c, respectively. A mechanism is proposed and it is substantiated by synthesis of6a from N-(2-car☐yphenyl)-C-phenylcarbamoyl hydrazidoyl chloride8a or its N-(2-methoxycarbonylcarbonylphenyl) analogue8d.
重氮化的邻氨基苯甲酸及其甲酯与取代的α-硫氰酸根乙酰乙酰苯胺3a-c反应,在两种情况下分别给出相应的噻二唑并[2,3 - b ]喹唑啉6a-c。提出了一种机理,并通过由N-(2-car☐yphenyl)-C-苯基氨基甲酰基肼基十二烷基氯8a或其N-(2-甲氧基羰基羰基苯基)类似物8d合成6a来证实其机理。