反应详情

The mixture of (1R)-4-hydroxy-1-(4,5-diphenyloxazol-2-yl)butylamine (5.8 g), 5-tert-butyldiphenylsilyloxy-1-tetralone (11 g) and p-toluenesulphonic acid (32 mg) in toluene (150 ml) was heated under reflux in Dean-Stark apparatus for 48 hours. After the solvent was removed in vacuo, the residue was dissolved in a mixture of methanol (50 ml) and THF (200 ml) and NaBH4(0.4 g) was added to the solution at −78° C. After being stirred for 4 hours at the same temperature, the solution was allowed to stand at the room temperature for 30 minutes, then poured into the mixture of ethyl acetate and water. The organic layer was washed with water and brine, dried over MgSO4 and evaporated in vacuo. The residue was purified by chromatography on silica gel to afford (1R)-1-[[(1R)-4-hydroxy-1-(4,5-diphenyloxazol-2-yl)butyl]amino]-5-tert-butyldiphenylsilyloxy-1,2,3,4-tetrahydronaphthalene (10.2 g).

1. temperaturewas heated
2. temperatureunder reflux in Dean-Stark apparatus for 48 hours
3. customAfter the solvent was removed in vacuo
4. dissolutionthe residue was dissolved in a mixture of methanol (50 ml) and THF (200 ml) and NaBH4(0.4 g)
5. additionwas added to the solution at −78° C
6. waitto stand at the room temperature for 30 minutes
7. additionpoured into the mixture of ethyl acetate and water
8. washThe organic layer was washed with water and brine
9. dry with materialdried over MgSO4
10. customevaporated in vacuo
11. customThe residue was purified by chromatography on silica gel