1,2,4-Triazoles. Improved synthesis of 5-substituted 4-amino-3-mer-cato-(4<i>H</i>)-1,2,4-triazoles and a facile route to 3,6-disubstituted 1,2,4-triazolo[3,4-<i>b</i>][1,3,4]thiadiazoles
作者:Francesco Paolo Invidiata、Giancarlo Furná、Ilaria Lampronti、Daniele Simoni
DOI:10.1002/jhet.5570340427
日期:1997.7
thiocarbohydrazide with carboxylic acids at the melting temperature allows an improved preparation of the S-substituted 4-amino-3-mercapto-1,2,4-triazole heterocycles. The crude 4-amino-5-mercapto-1,2,4-triazoles react easily with carboxylic acids or carboxylic acid chlorides to afford the 1,2,4-triazolo[3,4-fc][1,3,4]thiadiazole ring system.
硫代碳酰肼与羧酸在熔融温度下的反应可以改进S-取代的4-氨基-3-巯基-1,2,4-三唑杂环的制备。粗制的4-氨基-5-巯基-1,2,4-三唑容易与羧酸或羧酸氯化物反应,得到1,2,4-三唑并[3,4- fc ] [1,3,4]噻二唑环系。