反应详情

Sodium tungstate (0.02 g) was added to a solution of 2-bromomethyl-2-methyl-6-(2-phenoxyacetamido)penam-3-carboxylic acid (3.1 g) in acetic acid (8 ml) at 7°-10° C. under stirring and then to the mixture was added 30% aqueous hydrogen peroxide (1.2 ml). The mixture was stirred at 7°-10° C. for 1 hour. After the reaction, ice-water (50 ml) was added to the reaction mixture and then extracted with ethyl acetate. The extract was washed with water and back-extracted with 5% sodium bicarbonate aqueous solution. The aqueous layer was washed with ethyl acetate twice, acidified with 5% hydrochloric acid to pH2 and then extracted with ethyl acetate. The extract was washed with water, dried and concentrated to give powder of 2-bromomethyl-2-methyl-6-(2-phenoxyacetamido)penam-3-carboxylic acid-1-oxide (2 g).

1. stirringThe mixture was stirred at 7°-10° C. for 1 hour
2. additionwas added to the reaction mixture
3. extractionextracted with ethyl acetate
4. washThe extract was washed with water
5. extractionback-extracted with 5% sodium bicarbonate aqueous solution
6. washThe aqueous layer was washed with ethyl acetate twice
7. extractionextracted with ethyl acetate
8. washThe extract was washed with water
9. customdried
10. concentrationconcentrated