Triethylamine → HCID 70542433, compound

Participants

Reaction Steps

In dichloromethane (50 ml) was dissolved 7β-phenylacetamido-3-hydroxymethyl-3-cephem-4-carboxylic acid triethylamine salt (4.49 g) and, at room temperature, triethylamine (0.51 g) and diketene (1.26 g) were added. The reaction was conducted for 2 hours, after which time the solvent was distilled off under reduced pressure. The residue was diluted with water and adjusted to pH 6.0. This aqueous solution was extracted twice with ethyl acetate, brought down to pH 2.0 with 4 N-HCl and extracted three times with ethyl acetate. The ethyl acetate solution was washed with a saturated aqueous solution of sodium chloride, treated with magnesium sulfate and filtered. The solvent was distilled off under reduced pressure and the residue was recrystallized from ethyl acetate-ether. The above procedure provided 7β-phenylacetamido-3-(3-oxobutyryloxy)methyl-3-cephem-4-carboxylic acid (4.16 g) (yield 96.3%).

Provenance & Evidence