反应详情

A solution of 0.750 g (123 mmol) of 10 in 5 ml glacial acetic acid was cooled to 0°. To this was added 2 ml of HBr-acetic acid and the mixture was stirred at 0° for 45 seconds. The solution was filtered and the filtrate was poured into ice water and the mixture was partitioned between methylene chloride and water. The aqueous layer was washed with two portions of methylene chloride and the organic extracts were washed with aqueous Na2CO3 and water, dried over Na2SO4, and concentrated. The residue was chromatographed on silica gel using hexane-ethyl acetate eluent (9:1, v/v) to afford 0.388 g (88%) of the title compound (11) as a colorless wax, m.p. 34°. NMR (CDCl3, (CH3)4Si); δ0.90 (t, 3H, J=6 Hz), 1.25 (s, br, 26H), 1.59 (m, 2H), 2.10 (s, br, --OH), 2.19 (d of septets, 1H, JH--H)=6 Hz, JH--F =21 Hz), 3.45 (t, 2H, J=6.5 Hz), 3.63 (d, 2H, J=6 Hz), 3.85 (d, 2H, J=6 Hz, CH2OH), 4.64 (d of d, 2H, JH--H =6 Hz, JH-F=47 Hz).

1. filtrationThe solution was filtered
2. additionthe filtrate was poured into ice water
3. customthe mixture was partitioned between methylene chloride and water
4. washThe aqueous layer was washed with two portions of methylene chloride
5. washthe organic extracts were washed with aqueous Na2CO3 and water
6. dry with materialdried over Na2SO4
7. concentrationconcentrated
8. customThe residue was chromatographed on silica gel