反应详情

温度

0 °C

To a solution of (3R,4R)-3-benzyloxycarbonylamino-4-(2-oxoethyl)azetidin-2-one (850 mg) in methanol (17 ml) was added sodium borohydride (123 mg) at 0° C. and the mixture was stirred for 15 minutes at 0° C. Acetic acid (0.37 ml) was added to the mixture at 0° C. After stirring for 15 minutes at 0° C., the mixture was evaporated in vacuo. The residue was chromatographed on silica gel (17 g) eluting with a mixture of methylene chloride and methanol (20:1-10:1) to give a crystalline solid. This crude crystals were washed with ether and dried over phosphorous pentoxide to give (3R,4R)-3-benzyloxycarbonylamino-4-(2-hydroxyethyl)azetidin-2-one (748 mg). mp. 120°-121° C.

1. stirringAfter stirring for 15 minutes at 0° C.
2. customthe mixture was evaporated in vacuo
3. customThe residue was chromatographed on silica gel (17 g)
4. washeluting with a mixture of methylene chloride and methanol (20:1-10:1)
5. customto give a crystalline solid
6. washThis crude crystals were washed with ether
7. dry with materialdried over phosphorous pentoxide