2-Azido-1,3,4-thiadiazoles, 2-Azido-1,3-thiazoles, and Aryl Azides in the Synthesis of 1,2,3-Triazole-4-carboxylic Acids and Their Derivatives
作者:N. T. Pokhodylo、O. Ya. Shyyka、R. D. Savka、M. D. Obushak
DOI:10.1134/s1070428018070205
日期:2018.7
Diazotization of 2-amino-1,3,4-thiadiazoles gave 1,3,4-thiadiazole-2-diazonium sulfates which were converted to 2-azido-1,3,4-thiadiazoles. The latter reacted with ethyl acetoacetate in the presence of sodium methoxide in methanol to produce 1-(5-R1-1,3,4-thiadiazol-2-yl)-5-R2-1H-1,2,3-triazole-4-carboxylic acid derivatives. The reactions of 2-azido-5-methyl-1,3,4-thiadiazole and 2-azido-1,3-thiazole
2-氨基-1,3,4-噻二唑的重氮化反应得到1,3,4-噻二唑-2-重氮硫酸盐,将其转化为2-叠氮基1,3,4-噻二唑。后者在甲醇钠存在下于甲醇中与乙酰乙酸乙酯反应,生成1-(5-R 1 -1,3,4-噻二唑-2-基)-5-R 2 -1 H -1,2,3 -三唑-4-羧酸衍生物。2-叠氮基-5-甲基-1,3,4-噻二唑和2-叠氮基-1,3-噻唑与3-(1,3-苯并二恶酚-5-基)-3-氧代丙酸乙酯的反应导致温和条件下(K 2 CO 3,DMSO)形成1,2,3-三唑环。合成了各种1,2,3-三唑-4-羧酸衍生物。