反应详情

3-(4-Benzyloxy-2-nitrophenyl)-2-oxopropanoic acid methyl ester (4.1 g; 12.4 mmole) was dissolved in methanol (60 ml). Sodium borohydride (0.5 g; 13.12 mmole) was added in portions under stirring. TLC (silica gel, ethyl acetate:heptane, 1:1) after one hour showed remaining starting material and the formation of a by product. The reaction mixture was then cooled in an ice-bath and more sodium borohydride (0.2 g; 5.26 mmole) was added. After addition, the mixture was stirred at 0° C. until the starting material was consumed. The reaction mixture was evaporated to dryness. Ethyl acetate and water were added to the residue and the phases were separated. The organic phase was washed with brine and dried with magnesium sulfate and evaporated. Chromatography of the crude product on silica gel using a gradient of ethyl acetate in heptane as eluant gave 2.5 g (61% yield) of 3-(4-benzyloxy-2-nitrophenyl)-2-hydroxypropanoic acid methyl ester as an oil product.

1. temperatureThe reaction mixture was then cooled in an ice-bath
2. additionAfter addition
3. stirringthe mixture was stirred at 0° C. until the starting material
4. customwas consumed
5. customThe reaction mixture was evaporated to dryness
6. additionEthyl acetate and water were added to the residue
7. customthe phases were separated
8. washThe organic phase was washed with brine
9. dry with materialdried with magnesium sulfate
10. customevaporated