Behavior of 5,6-dihydrobenzo[h]cinnolinones towards hydrazine. Synthesis of benzo[h]cinnolinones and of 4-aminobenzo[h]cinnolinones

Stefania Villa, Giacomo Luca Evoli, Giorgio Cignarella, Michela M. Curzu, Gérard A. Pinna

Research output: Contribution to journalArticle


Dehydrogenation and amination of 4,4a,5,6-tetrahydro and 5,6- dihydrobenzocinnolinones in refluxing hydrazine hydrate to give new benzo[h]cinnolinones and 4-aminobenzo[h]cinnolinones are reported, and reaction mechanisms proposed. Experiments were also extended to 4,4a-dihydro- 5H-indenopyridazinone which underwent hydrazine induced dehydrogenation to 5H-indenopyridazin-3-one but not subsequent amination.

Original languageEnglish
Pages (from-to)485-492
Number of pages8
JournalJournal of Heterocyclic Chemistry
Issue number2
Publication statusPublished - 1999


ASJC Scopus subject areas

  • Organic Chemistry

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