Trifluoroacetic acid → HCID 131713439, compound

Participants

Reaction Steps

To a mixture of anisole (2 ml) and trifluoroacetic acid (6 ml) was added 7-[2-(2-amino-5-chlorothiazol-4-yl)-2-tert-butoxycarbonylmethoxyiminoacetamido]-3-cephem-4-carboxylic acid (syn isomer) (1.7 g) at 20° to 25° C. with stirring. The reaction mixture was stirred for an hour at the same temperature. The resultant solution was poured into a mixed solvent of dissopropyl ether (300 ml) and petroleum ether (100 ml). The precipitates were collected by filtration, washed with petroleum ether, and were dissolved in an aqueous solution of sodium bicarbonate at pH 7.5. The aqueous solution was washed with ethyl acetate, adjusted to pH 2.8 with a diluted hydrochloric acid, and extracted with a mixed solvent of ethyl acetate and tetrahydrofuran. The organic layer was washed with a saturated aqueous solution of sodium chloride and dried over magnesium sulfate. After removing the solvent in vacuo, diisopropyl ether was added to the residue. The insoluble precipitates were collected by filtration to give 7-[2-(2-amino-5-chlorothiazol-4-yl)-2-carboxymethoxyiminoacetamido]-3-cephem-4-carboxylic acid (syn isomer)(1.2 g), mp 165° to 167° C. (dec.).

Provenance & Evidence