Trifluoroacetic acid → HCID 88469656, compound

Participants

Reaction Steps

To a suspension of benzhydryl 7-[2-(2-formamidothiazol-5-yl)acetamido]-3-vinyl-3-cephem-4-carboxylate (11.48 g) in methylene chloride (57.4 ml) and anisole (15 ml) was added 2,2,2-trifluoroacetic acid (46 ml) under ice-cooling, and the mixture was stirred at 7° to 8° C. for 15 minutes. After the reaction mixture was poured into diisopropyl ether (600 ml), it was stirred under ice-cooling for 20 minutes, followed by collecting the insoluble substance by filtration and washing it with diisopropyl ether. This substance (11.4 g) was suspended in water (150 ml), adjusted to pH 6.5 with sodium bicarbonate and then treated with charcoal. The resultant filtrate was adjusted to pH 2.0 with 10% hydrochloric acid, and the precipitated substance was collected by filtration, washed with water and then dried to give 7-[2-(2-formamidothiazol-5-yl)acetamido]-3-vinyl-3-cephem-4-carboxylic acid (5.88 g), mp 200° C. (dec.).

Provenance & Evidence