Synthesis of N-Heteroarylamidines of 1,2,3-Thiadiazole-4-carboxylic Acid from 2-Cyanothioacetamides and 5-Azido-1-methyl-4-nitroimidazole.

The reaction of 2-cyanothioacetamides with 5-azido-1-methyl-4-nitroimidazole in ethanol in the presence of sodium ethoxide at 0°С lead to the formation of previously unknown N-heteroarylamidines of 1,2,3-thiadiazole-4-carboxylic acid in 58–76% yields.