Phosphoric Acid → 7beta-(Thienylacetamido)-3-azidomethyl-3-cephem-4-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

7β-(Thienylacetamido)-3-[2-(N-carboethoxysulfamoyl)-benzoyloxy]methyl-3-cephem-4-carboxylic acid-etherate (619 mg), sodium azide (100 mg) and sodium bicarbonate (84 mg) are dissolved in phosphate buffer solution (pH 6.4) (10 ml) and the mixture is stirred at 60° C. for one hour. After cooling, the reaction mixture is acidified by phosphoric acid and extracted with ethyl acetate. The ethyl acetate layer is dried and concentrated under reduced pressure. The residue is triturated with ether. The procedure provides 7β-(thienylacetamido)-3-azidomethyl-3-cephem-4-carboxylic acid.

Provenance & Evidence