Trifluoroacetic acid → HCID 131718948, compound

Participants

Reaction Steps

To a suspension of 7β-[2-(2-aminothiazol-4-yl)-2-tert-butoxycarbonylmethoxyiminoacetamido]-3-[1-methyl-4-(3,4-dihydroxybenzoyl)-1-piperazinio]methyl-3-cephem-4-carboxylate dihydrochloride (syn isomer) (1.35 g) in dichloromethane (5.4 ml) and anisole (1.3 ml) was added dropwise trifluoroacetic acid (4 ml) at 25° C. The stirring was continued for 3 hours at the same temperature. The reaction mixture was poured into diisopropyl ether and the resulting precipitates were collected by filtration. The precipitates were dissolved in water and then adjusted to pH 3.0 with aqueous sodium bicarbonate. The resulting solution was subjected to column chromatography on Diaion HP-20 using 15% aqueous isopropyl alcohol as an eluent. The object fractions were lyophilized to give 7β-[2-(2-aminothiazol-4-yl)-2-carboxymethoxyiminoacetamido]-3-[1-methyl-4-(3,4-dihydroxybenzoyl)-1-piperazinio]methyl-3-cephem-4-carboxylate (syn isomer) (320 mg).

Provenance & Evidence