3-Fluoro-p-toluic acid → Diethyl (3-fluoro-4-methylbenzoyl)aminomalonate

Participants

Reaction Steps

To a solution of 10.1 g of 3-fluoro-4-methylbenzoic acid and 15.2 g of diethyl aminomalonate hydrochloride in 200 ml of N,N-dimethylformamide, 9.7 g of 1-hydroxybenzotriazole, 23 ml of triethylamine and 13.8 g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride were added sequentially, and stirred for 1 hour at room temperature. After addition of water to the reaction solution, the mixture was extracted with ethyl acetate. The extract was washed with water, 10% hydrochloric acid, water, saturated aqueous sodium hydrogen carbonate solution sequentially and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was crystallized by addition of isopropyl ether to provide 15.1 g of the objective compound as colorless crystals. M.p. 102-103° C.

Provenance & Evidence