Imidazo[1,2-B]Pyridazines. I. Some 3-Alkoxy-6-Halogeno-2-Phenyl-(and 4′-Substituted Phenyl)Imidazo[1,2-B]Pyridazines and 3-Methoxy-2,6-Diphenylimidazo[1,2-B]Pyridazine

Abstract

A series of 3-alkoxy-6-halogeno-2-phenyl(and 4′-substituted phenyl) imidazo [1,2-b] pyridazines (1) and 3-methoxy-2,6- diphenylimidazo [1,2-b] pyridazine have been prepared from the relevant pyridazin-3-amines and arylglyoxals, followed by O- alkylation of the corresponding imidazo [1,2-b]pyridazin-3(5H)-ones with diazoalkanes. 6- Chloro-3-methoxy-2-phenylimidazo[2,1-a] phthal-azine was prepared similarly.