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

…, G Cignarella, MM Curzu, GA Pinna

Index: Villa, Stefania; Evoli, Giacomo Luca; Cignarella, Giorgio; Curzu, Michela M.; Pinna, Gerard A. Journal of Heterocyclic Chemistry, 1999 , vol. 36, # 2 p. 485 - 492

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Citation Number: 2

Abstract

Abstract 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 ...