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Paper | Regular issue | Vol 29, No. 11, 1989, pp.2149-2156
Published online, 1st January, 1970
DOI: 10.3987/COM-89-5143
Cyclization Reactions of Arylhydrazone Adducts — Synthesis of 1-Aryl-1H-1,2,4-triazolo[4,3-b]indazoles

Giuseppe Cusmano, Gabriella Macaluso, Michelangelo Grueeadauria, and Silvestre Buscemi

*Dipartimento Chimica Organica, Università digli Studi di Palermo, Viale delle Scienze, 90128 Palermo, Italy


The 1,3-addition reaction of nitrilimines to 3-indazolinone 11 and the acid assisted 6 π heteroelectrocyclic reaction of hydrazone adducts 13 have been investigated. Synthesis of the 1,3-substituted 1H-1,2,4-triazolo[4,3-b]-indazole system 17 via cyclization of 13 is described.