Abstract
The transformation of 1,2,3‐thiadiazolyl hydrazones of aldehydes and ketones including Dimroth rearrangement giving 1‐alkylidenamino‐5‐mercapto‐1,2,3‐triazoles, alkylation of mercapto group of these heterocyclic compounds by α‐bromoacetophenones and cyclization giving 6,7‐dihydro‐5H‐[1,2,3]triazolo[5,1‐b][1,3,4]thiadizines have been investigated. It was shown that the reaction for hydrazones of acetophenones and benzoaldehydes is diastereoselective. Triazolothiadiazine spiro derivatives were prepared with transformation of hydrazones of cyclic ketones.
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