Sodium Sulfide → 7-Amino-3-methoxymethyl-3-cephem-4-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To 10 ml of nitromethane were added 2.72 g of 7-ACA, 2.2 g of methanol, 9.0 g of bismuth trichloride and 5.9 g of ferric chloride. The mixture was heated at 30° C. for 160 min to advance a reaction After completion of the reaction, the reaction mixture was cooled to 5° C. To the reaction mixture was added 50 ml of water. Then, the mixture was adjusted to pH 1 with sodium bicarbonate and, then, further adjusted to pH 7.5 with sodium sulfide while cooling on ice. The resulting precipitate was filtered off, and then washed with water. The filtrate was combined with the washings. The resulting mixture was adjusted to pH 3.5 with 36 % hydrochloric acid. To the mixture was added 50 ml of methanol, and the mixture was allowed to stand at 5° C. for 10 hours, thereby to form a precipitate. The precipitate was collected by filtration, and washed with 10 ml of cold water and, then, with 10 ml of cold methanol to obtain the desired product, namely 7-amino-3-methoxymethyl-3-cephem-4-carboxylic acid. The amount of the desired product was 1.37 g. The yield of the desired product was 56 %.

Provenance & Evidence