反应详情

A mixture of platinum oxide (60.0 mg), water (4.2 ml), aqueous dipotassium hydrogen phosphate (1.0M, 0.385 ml) and ethanol (0.6 ml) was shaken for 30 minutes under a hydrogen atmosphere (50 psi) at ambient temperature. The mixture was added to a solution of 4-nitrobenzyl (5R,6R)-6-[1-methyl-1-(4-nitrobenzyloxycarbonyloxy)ethyl]-3-[2-(4-nitrobenzyloxycarbonylamino)-ethylthio]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylate (60.0 mg) in dioxane (7.2 ml) and shaken for 2 hours under a hydrogen atmosphere (50 psi) at ambient temperature. The reaction mixture was filtered using diatomaceous earth and the filter-cake was washed with water (20 ml). The combined filtrates (32 ml) were lyophilized over a period of 4 hours. The residue was chromatographed on non-ionic adsorption resin, Diaion HP-20-AG (trade mark, made by Mitsubishi Chemical Industries) (13×230 mm) eluting with water (120 ml) and then a mixture of water and isopropanol (19:1, 60 ml). The fractions showing UV maxima at 296 nm were collected, concentrated and lyophilized to give potassium (5R,6R)-3-(2-aminoethylthio)-6-(1-hydroxy-1-methylethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (10.4 mg) as pale yellow powder.

1. stirringshaken for 2 hours under a hydrogen atmosphere (50 psi) at ambient temperature
2. filtrationThe reaction mixture was filtered
3. washthe filter-cake was washed with water (20 ml)
4. waitThe combined filtrates (32 ml) were lyophilized over a period of 4 hours
5. customThe residue was chromatographed on non-ionic adsorption resin, Diaion HP-20-AG (trade mark, made by Mitsubishi Chemical Industries) (13×230 mm)
6. washeluting with water (120 ml)
7. additiona mixture of water and isopropanol (19:1, 60 ml)
8. customwere collected
9. concentrationconcentrated