Monomethyl sulfate → 7-Amino-3-methoxymethyl-3-cephem-4-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

11.30 g of a methanolic solution of methoxysulfonic acid (prepared as described in Preparation 1) and 3.11 g of trimethyl borate were added to 30 ml of dimethyl maleate. The mixture was cooled to 25° C., and 2.74 g of 7-ACA were added thereto, followed by stirring at 25° C. for 1 hour. After completion of the reaction, the reaction mixture was treated following the procedures described in Example 2 to give 2.04 g (yield 83%) of the desired compound at a high purity.

Provenance & Evidence