Novel Ring-Opening Reactions of 3-Substituted 1-Amino-2-thioxo-4-imidazolidinones: Preparation of Functionalized 3,6-Dihydro-2<i>H</i>-1,3,4-thiadiazines and 3,4-Dihydro-1<i>H</i>-1,2,4-triazoles
作者:Pedro Molina、Antonio Arques、Inmaculada Cartagena、José María Olmos
DOI:10.1055/s-1989-27304
日期:——
1-Amino-2-thioxo-4-imidazolidinones 1 react with phenacyl bromides to yield 3-alkoxycarbonylmethyl-5-aryl-2-iminio-3,6-dihydro-2H-1,3,4-thiadiazine salts 3. Compounds 1 also react with aryl isothiocyanates to give N-aryl-N′-(3-aryl/alkyl-4-oxo-2-thioxoimidazolidinyl)thioureas 6, which by the action of amines undergo a ring-closure/ring-opening reaction to give 4-aryl-1-aryl/alkylaminocarbonylmethyl-3-sulfido-5-thioxo-3, 4-dihydro-1H-1,2,4-triazole derivatives 7.
1-氨基-2-硫代-4-咪唑烷酮 1 与苯乙酰溴反应,生成 3-烷氧羰基甲基-5-芳基-2-亚胺-3,6-二氢-2H-1,3,4-噻二唑盐 3。化合物 1 还与芳基异硫氰酸酯反应,生成 N-芳基-N′-(3-芳基/烷基-4-氧-2-硫代咪唑烷酮)硫脲 6,这种化合物在胺的作用下发生环闭合/环打开反应,生成 4-芳基-1-芳基/烷基氨基羰基甲基-3-硫代-5-硫代-3,4-二氢-1H-1,2,4-三唑衍生物 7。