Carbon Tetrachloride → 7-Amino-3-methoxymethyl-3-cephem-4-carboxylic acid

Temperature

10 °C

To 10 ml of carbon tetrachloride were added 2.72 g of 7-ACA, 15 g of antimony pentachloride and 1.40 g of methanol. The mixture was cooled at 10° C. for 80 min to advance a reaction. After completion of the reaction, the reaction mixture was cooled to 5° C. To the reaction mixture was added 150 ml of water. Then, the mixture was adjusted to pH 7.7 with sodium bicarbonate at a temperature of from 0° C. to 5° C. 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, and then concentrated by evaporation under reduced pressure so that a precipitate was formed. 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 0.61 g. The yield of the desired product was 25 %.

1. customa reaction
2. customAfter completion of the reaction
3. temperaturethe reaction mixture was cooled to 5° C
4. filtrationThe resulting precipitate was filtered off
5. washwashed with water
6. concentrationconcentrated by evaporation under reduced pressure so that a precipitate
7. customwas formed
8. filtrationThe precipitate was collected by filtration
9. washwashed with 10 ml of cold water

ORD record

ord-41af3223116f4b02a742de7839ad9b84

Source dataset

uspto-grants-1990_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04902793