反应详情

温度

-78 °C

A mixture of E-methyl-5-hydroxy-3-oxo-7-tributylstannyl-6-heptenoate (7.19 g) and 1M triethylborane in tetrahydrofuran (23.4 ml) in anhydrous tetrahydrofuran (40 ml) is stirred at 20°-25° C. for about 20 minutes. The mixture is cooled to -78° C., sodium borohydride (0.677 g) added, stirred for 10 minutes, methanol (15 ml) added over about 30 minutes maintaining temperature below -68° C. and stirred at -78° C. for about 2 hours. The mixture is allowed to warm to -60° C. and 30% hydrogen peroxide (35 ml) in water (86 ml) is added. The mixture is allowed to warm to room temperature while stirring for about 30 minutes, diluted with ether and the layers separated. The organic solution is washed with saturated sodium chloride solution, dried over magnesium sulfate, filtered and concentrated in vacuo. The crude product is purified by flash chromatography in 25% ethyl acetate in hexane to give the desired product.

1. stirringstirred for 10 minutes
2. temperaturemaintaining temperature below -68° C.
3. stirringstirred at -78° C. for about 2 hours
4. temperatureto warm to -60° C.
5. temperatureto warm to room temperature
6. stirringwhile stirring for about 30 minutes
7. customthe layers separated
8. washThe organic solution is washed with saturated sodium chloride solution
9. dry with materialdried over magnesium sulfate
10. filtrationfiltered
11. concentrationconcentrated in vacuo
12. customThe crude product is purified by flash chromatography in 25% ethyl acetate in hexane