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Communication | Special issue | Vol 37, No. 1, 1994, pp.171-174
Published online, 1st January, 1970
DOI: 10.3987/COM-93-S19
Efficient and Facile Syntheses of [4,5]-Annelated Pyridazines from 4-Pyridazinecarbaldehydes

Péter Mátyus,* Kaoru Fuji, and Kiyoshi Tanaka*

*Institute for Chemistry, Kyoto University, Uji, Kyoto 611-0011, Japan


New synthetic approaches to novel [4,5]-annelated pyridazine derivatives through the closely related intermediates, are described. These include derivatives of two angularly oriented ring systems (4) and (5), as well as those of pyrano[2,3-d]- and pyrazolo[3,4-d]pyridazines (6) and (8). The tertiary amino effect was successfully applied to the construction of the former compounds, whereas the latter compounds were formed by the cyclization based on additionelimination sequences.