Trifluoroacetic acid → Ethyl 2-[2-(2,4-difluorophenylamino)-5-fluoro-6-methoxynicotinoyl]acetate

Participants

Reaction Steps

In 2 ml of anisole was dissolved 200 mg of diphenylmethyl ethyl 2-(2,4-difluorophenylamino)-5-fluoro-6-methoxynicotinoylmalonate, and 2 ml of trifluoroacetic acid was added thereto with ice-cooling, after which the resulting mixture was subjected to reaction at the same temperature for 10 minutes. The solvent was removed by distillation under reduced pressure, and to the crystalline material thus obtained was added 2 ml of diisopropyl ether, after which crystals were collected by filtration to obtain 120 mg (yield 94.3%) of ethyl 2-[2-(2,4-difluorophenylamino)-5-fluoro-6-methoxynicotinoyl]acetate.

Provenance & Evidence