Pyridine → HCID 19778184, compound

Participants

Reaction Steps

Thionyl chloride (1.5 ml) was added to a solution of 2-(4-fluoro-2-methoxybenzoyl)benzoic acid (mp 119°-120° C.) (3.66 g) and pyridine (0.03 ml) in benzene (50 ml), followed by refluxing for an hour. The solvent was distilled off to give 2-(4-fluoro-2-methoxybenzoyl)benzoyl chloride (IRνmaxNujol : 1795 cm-1). A solution of this product in methylene chloride (40 ml) was added to a solution of ethyl 4-isopropylaminocrotonate (Reference Example I) (3.6 g) and triethylamine (3.0 ml) in methylene chloride (40 ml), followed by stirring at room temperature for 16 hours. After removing the solvent, ethyl acetate was added to the residue. The mixture was washed with water, dil. hydrochloric acid, water, sodium hydrogen carbonate solution and water in turn. The ethyl acetate layer was dried over anhydrous sodium sulfate and distilled to give the title compound (5.50 g) as pale brown oily substance.

Provenance & Evidence