Selenium heterocycles XVIII: Synthesis and antibacterial activity of 4‐substituted (1,2,3‐selenadiazol‐5‐yl)carbamic acid esters and their sulfur analogs
4-Substituted (1,2,3-selenadiazol-5-yl)carbamicacidesters and their sulfuranalogs were prepared from the Curtius rearrangement of the corresponding carboxazides. None of the compounds showed significant antibacterialactivity.
The alkylations of 5-acylamino-1,2,3-thiadiazoles (4) have been investigated; the N-3 position is preferably alkylated forming new mesoionic heterocycles (5) and (10). The mesoionic 1,2,3-thiadiazolium-5-alkoxy- and -5-aryloxy-carbonylaminides are converted into the corresponding salts of the 5-imine derivatives (11) by hydrolysis with hydrochloric acid.