Novel heterocyclization of hydrazinopyridazinones with dimethyl acetylenedicarboxylate with dehydrogenation and rearrangement
- 1 January 1991
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- No. 5,p. 991-996
- https://doi.org/10.1039/p19910000991
Abstract
5-Hydrazinopyridazin-3(2H)-ones 1 reacted with dimethyl acetylenedicarboxylate 2 to give 4,6-dihydropyridazino[4,5-c] pyridazin-5-(1H)-ones 3 by cyclization with dehydrogenation. On the other hand, the reaction of 4-bromo-5-hydrazino- and 5-bromo-4-hydrazinopyridazin-3(2H)-ones 8 and 10 with diester 2 resulted in the novel cyclization with rearrangement to give compounds 3 and 9 together with the expected cyclization products.Keywords
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