反应详情

A solution of 4,4-dimethyl-7-(1-methylene-hexyl)-chroman (0.442 g, 1.71 mmole) in 8 mL of THF at 0° C. was treated with 1.71 mL of 1M BH3.THF complex. The reaction mixture was stirred at room temperature for three hours and then cooled to 0° C. The mixture was treated successively with 0.3 mL of water, 0.34 mL of 3M sodium hydroxide and 0.34 mL of 30% hydrogen peroxide, stirred at room temperature for two hours and then diluted with 10 mL of water. The pH was adjusted to 4.0 with 10% HCl and extracted with three 12.5 ML portions of ether. The combined organic extracts were dried over MgSO4, filtered and concentrated in vacuo to give a pale yellow oil. The product was purified by flash chromatography (SiO2, 10-20% ethyl acetate in hexanes) to yield 0.366 g of 2-(4,4-dimethyl-chroman-7-yl)-heptan-1-ol as a colorless oil.

1. temperaturecooled to 0° C
2. stirringstirred at room temperature for two hours
3. extractionextracted with three 12.5 ML portions of ether
4. dry with materialThe combined organic extracts were dried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customto give a pale yellow oil
8. customThe product was purified by flash chromatography (SiO2, 10-20% ethyl acetate in hexanes)