Ethyl 5-aminopyridazine-4-carboxylate → 5-[2-(2,4,6-Trifluorophenyl)-acetylamino]-pyridazine-4-carboxylic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

5-Aminopyridazine-4-carboxylic acid ethyl ester (1.26 g, prepared according to J. Het. Chem., (1968), 5, 845) was dissolved in dry toluene (125 ml) at 90° C., and DMAP (0.92 g) was added. 2,4,6-Trifluorophenylacetyl chloride (1.75 g of 95% purity material) was added dropwise with stirring at 70° C., and a white solid precipitated. The reaction was stirred at reflux for 5 hours and then filtered hot. The filtrate was evaporated to give 5-[2-(2,4,6-trifluorophenyl)-acetylamino]-pyridazine-4-carboxylic acid ethyl ester as a white solid (2.6 g), m.p. 143-144° C.

Provenance & Evidence