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A facile synthesis of pyrazolo[3,4-D]pyridazines Via the 1,3-dipolar cycloaddition of 3-arylsydnones. Synthesis and computational studies of 1-aryl-4,5-dihydro-1H-pyrazolo[3,4-D]pyridazine-3,6-diones and their 3,6-dichloro derivatives.

✍ Scribed by R. Sanyal; Bharati V. Badami

Publisher
Journal of Heterocyclic Chemistry
Year
2006
Tongue
English
Weight
524 KB
Volume
43
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

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The synthetic utility of 1,3‐dipolar cycloaddition of DMAD to sydnones has been exploited in the preparation of new 1‐aryl‐4,5‐dihydro‐1__H__‐pyrazolo[3,4‐d]pyridazine‐3,6‐diones 7a‐j and their aromatic 3,6‐dichloro analogues 8a‐j. The lactam‐lactim tautomerism of compound 7a has been studied by the semi emperical (PM3) and ab initio methods.

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