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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.
K. Masuda, J. Adachi, H. Nate, H. Takahata and K. Nomura, J. Chem. Soc., Perkin Trans. 1, 1981, 1591 DOI: 10.1039/P19810001591
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