反应详情

10% Palladium on carbon (216 mg.) was added to a solution of 4-nitrobenzyl 7-[2-(6-formamidopyridin-2-yl)-2-methoxyiminoacetamido]-3-cephem-4-carboxylate (540 mg.) in tetrahydrofuran (10 ml.), methanol (5 ml.), acetic acid (0.075 ml.), and water (0.75 ml.). The mixture was subjected to catalytic reduction at ambient temperature under ordinary pressure for 5 hours, and then allowed to stand overnight. After filtered off the catalyst, the filtrate was concentrated under reduced pressure. Ethyl acetate and an aqueous solution of sodium bicarbonate were added to the residue, and the aqueous layer was separated. The solution was adjusted to pH 2 with 10% hydrochloric acid. The appeared precipitates were collected by filtration, washed with water and dried to give 7-[2-(6-formamidopyridin-2-yl)2-methoxyiminoacetamido]-3-cephem-4-carboxylic acid (300 mg.), mp. 202° to 204° C. (dec.).

1. waitto stand overnight
2. filtrationAfter filtered off the catalyst
3. concentrationthe filtrate was concentrated under reduced pressure
4. additionEthyl acetate and an aqueous solution of sodium bicarbonate were added to the residue
5. customthe aqueous layer was separated
6. customThe appeared precipitates
7. filtrationwere collected by filtration
8. washwashed with water
9. customdried