Potassium Carbonate → Methyl 1-cyclopropyl-7-chloro-6-fluoro-8-methoxy-1,4-dihydro-4-oxo-3-quinolinecarboxylate

Participants

Reaction Conditions

Reaction Steps

34.7 g of anhydrous K2CO3 (0.35 mol) was added to a solution of 62.6 g of methyl 2-(2,4-dichloro-5-fluoro-3-methoxybenzoyl)-3-cyclopropylaminoacrylate in 220 ml of DMF. The reactant was stirred at 40-45° C. for 2.5 hours, and the reaction was monitored by TLC. The resulting mixture was then poured into 800 ml of ice-water, filtered, washed with water (100 ml×2), and dried. The resulting solid was dissolved in 120 ml of 95% methanol and then refluxed for 15 minutes, cooled, filtered and dried to afford 50.8 g of methyl 1-cyclopropyl-7-chloro-6-fluoro-8-methoxy-1,4-dihydro-4-oxo-3-quinolinecarboxylate (0.156 mol) as a white solid, mp 184-187C., in 90.1% yield.

Provenance & Evidence