反应详情

To a solution of (2S,4R)-1-benzyloxycarbonyl-2-[{3-(ethoxycarbonyl)-2-methanesulfonyloxypropyl}oxymethyl]-4-methanesulfonyloxypyrrolidine (3.7 g) in tetrahydrofuran (40 ml) was added 1,8-diazabicyclo[5.4.0]undec-7-ene (5.1 ml) at ambient temperature and the mixture was stirred for one hour. Removal of the solvent in vacuo gave an oil which was dissolved in a mixture of ethyl acetate (100 ml), water (50 ml) and 1N-hydrochloric acid (10 ml). The organic layer was separated, washed twice with brine (50 ml) and dried over magnesium sulfate. Evaporation of the solvent gave a residue, which was chromatographed on silica gel (200 ml) eluting with a mixture of hexane and ethyl acetate (1:1 V/V) to give (2S,4R)-1-benzyloxycarbonyl-2-[{3-[ethoxycarbonyl)-2-propenyl}oxymethyl]-4-methanesulfonyloxypyrrolidine (2.72 g).

1. customRemoval of the solvent in vacuo
2. customgave an oil which
3. customThe organic layer was separated
4. washwashed twice with brine (50 ml)
5. dry with materialdried over magnesium sulfate
6. customEvaporation of the solvent
7. customgave a residue, which
8. customwas chromatographed on silica gel (200 ml)
9. washeluting with a mixture of hexane and ethyl acetate (1:1 V/V)