Ammonia → 7-Amino-3-(1-methyltetrazol-5-ylthiomethyl)-3-cephem-4-carboxylicacid

Beteiligte Stoffe

Reaktionsschritte

A 320 ml portion of acetonitrile was added to 54.5 g of 7-ACA and 25,6 g of 5-mercapto-1-methyl-1H-tetrazole, and 296.7 g of DCPA was added to the mixture with stirring and under cooling at -20° to -10° C. After the dissolution, the reaction mixture was stirred at 15° to 17° C. for 40 minutes to allow the reaction to proceed, cooled and poured into 1.8 kg of ice-water. The mixture was allowed to stand at 5° C. overnight, cooled by adding ice under stirring and adjusted to pH 4.0 with 25% aqueous ammonia. The resulting precipitate was recovered by filtration, washed with 480 ml of cold water and 500 ml of acetone successively, and dried, thereby affording 62.2 g (94.7% of yield) of 7-amino-3-(1-methyl-1H-tetrazol-5-yl)thiomethyl-3-cephem-4-carboxylic acid.

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