Dimethylformamide → HCID 68602527, compound

Participants

Reaction Steps

To a solution (60 ml) of 2-chloro-4-fluoro-3-methylbenzoic acid (5.66 g) synthesized by a known method in THF were added thionyl chloride (10.7 g) and DMF (0.2 ml) with stirring under ice-cooling, and the mixture was stirred at 70° C. for 3 hr. The solvent was evaporated under reduced pressure, and the residue was dissolved in dry THF (50 ml) and added dropwise to a mixture of concentrated aqueous ammonia (130 ml) and THF (86 ml) with stirring under ice-cooling. The mixture was stirred at the same temperature for 1 hr and extracted with ethyl acetate. The organic layer was washed with saturated brine and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure, and the precipitated crystals were collected by filtration, washed with diethyl ether and dried to give 2-chloro-4-fluoro-3-methylbenzamide (4.82 g) as crystals.

Provenance & Evidence