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Synthesis of 1-substituted [1,2,3]triazolo[4,5-d]pyridazines as precursors for novel tetraazapentalene derivatives

✍ Scribed by K. C. V. Ramanaiah; Edwin D. Stevens; Mark L. Trudell; Philip F. Pagoria

Publisher
Journal of Heterocyclic Chemistry
Year
2000
Tongue
English
Weight
438 KB
Volume
37
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

A series of 1‐substituted 4,5‐diformyl‐[1,2,3]triazole derivatives were prepared by 1,3‐dipolar cyclo‐addition of aryl azides with acetylene dicarboxaldehyde mono‐diethylacetal. The triazoles were readily converted into 1‐substituted [1,2,3]triazolo[4,5‐d]pyridazines in good yields. The 1‐(2‐nitrophenyl)‐[1,2,3]triazolo[4,5‐d]pyridazine was found to be a useful intermediate for the generation of the novel 5__H__‐benzo[1,2,3]triazolo[1′,2′:1,2]triazolo[4,5‐d]pyridazin‐6‐ium inner salt ring system.

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