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Paper | Special issue | Vol 37, No. 1, 1994, pp.401-411
Published online, 1st January, 1970
DOI: 10.3987/COM-93-S23
Synthesis of 3,4-Dihydropyridazino[1,6-a]benzimidazoles

Mohamed Khodja, Dieter Sicker, and Horst Wilde*

*Institut für Organische Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany


3,4-Dihydropyridazino[1,6-a]benzimidazoles (4a-e) have been prepared by catalytical hydrogenation of dialkyl (E)-2-(substituted 2-nitrophenylhydrazono) glutarates (1a-e) to the respective amines (2) followed by their base catalyzed cyclization in a tandem reaction proceeding via 4,5-dihydropyridazin-6(1H)-one intermediates (3).