Hydrochloric Acid → Diphenylmethyl 7beta-amino-3-[(pyrazol-4-yl)methylthio]-3-cephem-4-carboxylate

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Reaction Steps

Diphenylmethyl 7β-formamido-3-[(pyrazol-4-yl)methylthio]-3-cephem-4-carboxylate (2.96 g) was dissolved in methanol (30 ml) and concentrated hydrochloric acid (2.2 ml) was added thereto at the room temperature. Stirring was continued for 3 hours, then solvent was evaporated. The residue was diluted with a mixture of water. The ethyl acetate and aqueous layer was adjusted to pH 6.5 with 30% aqueous potassium carbonate. The organic layer was separated, washed with water and brine, and dried over magnesium sulfate. Solvent was evaporated to afford diphenylmethyl 7β-amino-3-[(pyrazol-4-yl)methylthio]-3-cephem-4-carboxylate (1.50 g).

Provenance & Evidence