反应详情

To a solution of allyl (5R,6S)-3-(1-allyloxycarbonyl-1,2,3,6-tetrahydropyridin-4-yl)-6-[(1R)-1-hydroxyethyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (0.280 g) in tetrahydrofuran (9 ml) were added successively triphenylphosphine (0.094 g), 5,5-dimethyl-1,3-cyclohexanedione (dimedone) (0.201 g) and tetrakis(triphenylphosphine) palladium(0) (41.5 mg). After stirring at ambient temperature for 1 hour, the mixture was poured into a mixture of cold water (50 ml) and ethyl acetate (30 ml). The separated aqueous layer was washed with ethyl acetate (30 ml×2) and concentrated in vacuo to remove the organic solvent. The residue was chromatographed on acid aluminum oxide (3 ml) eluting with water. The fractions containing the desired compound were collected and chromatographed on nonionic adsorption resin, "Diaion HP-20" (Trademark, made by Mitsubishi Chemical Industries) (20 ml) eluting with water. The fractions containing the desired compound were collected and lyophilized to give (5R,6S)-6-[ (1R)-1-hydroxyethyl]-7-oxo-3-(1,2,3,6-tetrahydropyridin-4-yl)-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid (68 mg).

1. washThe separated aqueous layer was washed with ethyl acetate (30 ml×2)
2. concentrationconcentrated in vacuo
3. customto remove the organic solvent
4. customThe residue was chromatographed on acid aluminum oxide (3 ml)
5. washeluting with water
6. additionThe fractions containing the desired compound
7. customwere collected
8. customchromatographed on nonionic adsorption resin, "Diaion
9. wash" (Trademark, made by Mitsubishi Chemical Industries) (20 ml) eluting with water
10. additionThe fractions containing the desired compound
11. customwere collected