Oa. Attanasi et al., NOVEL AND CONVENIENT SYNTHESIS OF 1,4-DIHYDROPYRIDAZINES AND PYRIDAZINES FROM AMINOCARBONYLAZOALKENES, Synlett, (12), 1997, pp. 1361-1362
1-Unsubstituted 1,4-dihydropyridazines have been obtained in good to e
xcellent yields by reaction of aminocarbonylazoalkenes with beta-trica
rbonyl compounds under mild conditions. Treatment at room temperature
of 1-unsubstituted 1,4-dihydropyridazines with phenyltrimethylammonium
tribromide directly afforded the relevant pyridazine derivatives in h
igh yield.