Synthesis of 1, 2, 3??thiadiazolo [4, 5??d] pyridazines, A new heterocyclic ring system

A Shafiee

Index: Shafiee,A. Journal of Heterocyclic Chemistry, 1976 , vol. 13, p. 301 - 304

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Citation Number: 12

Abstract

Abstract A method was developed for the synthesis of 5-carbethoxy-4-formyl-1, 2, 3- thiadiazole (I), its isomer (II); 5-benzoyl-4-formyl-1, 2, 3-thiadiazole (III), and its isomer (IV). It was demonstrated that although compounds I, III and IV with hydrazine gave 7H-1, 2, 3- thiadiazolo [4, 5-d]-pyridazin-7-one (XXII), 7-phenyl-1, 2, 3-thiadiazolo [4, 5-d] pyridazine (XXIII) and 4-phenyl-1, 2, 3-thiadiazolo [4, 5-d] pyridazine (XXV), respectively; however, ...