Chloroform → N-(6-chloro-3-pyridazinyl)-5-fluoro-1,6-dimethyl-4-hydroxy-2-oxo-1,2-dihydropyridine-3-carboxamide

Participants

Reaction Conditions

Reaction Steps

600 mg of ethyl 5-fluoro-1,6-dimethyl-4-hydroxy-2-oxo-1,2-dihydropyridine-3-carboxylate and 194 mg of 3-amino-6-chloropyridazine were added to 5 ml of bromobenzene, and the mixture was stirred at 160° C. for 4 hours. The reaction mixture was cooled to room temperature, and subjected to silica gel chromatography (chloroform:methanol=20:1). The resulting crude product was washed with a mixture of t-butyl methyl ether and n-hexane, and dried to obtain 311 mg of N-(6-chloro-3-pyridazinyl)-5-fluoro-1,6-dimethyl-4-hydroxy-2-oxo-1,2-dihydropyridine-3-carboxamide (hereinafter, referred to as present compound 19) represented by the formula:

Provenance & Evidence