反应详情

Potassium tert-butoxide (50 mg) was added to a suspension of methyltriphenylphosphonium bromide in tetrahydrofuran (4 ml) at 0° C. After 0.5 hr, a solution of (±)-3-[2,4-bis(methoxymethoxy)phenyl]cyclohexanone (100 mg) in tetrahydrofuran (1 ml) was added, and the mixture was allowed to warm to ambient temperature. After 16 hr, the reaction mixture was partitioned between ammonium chloride (30 ml of a saturated aqueous solution) and ethyl acetate. The aqueous layer was extracted with further ethyl acetate (2×30 ml), and the combined organic extracts were washed with brine (30 ml), dried over magnesium sulfate, and evaporated in vacuo. The crude residue was purified by flash column chromatography (SiO2, ethyl acetate/petrol, 4:1 v/v) to furnish the title compound as pale yellow oil (80 mg, 81%). δH (CDCl3) 1.50 (2H, m), 1.90 (2H, m), 2.05 (1H, m), 2.16 (1H, m), 2.35 (1H, m), 2.44 (1H, m), 2.97 (1H, m), 3.44 (3H, s), 3.48 (3H, s), 4.64 (1H, s), 4.69 (1H, s), 5.13 (2H, s), 5.17 (2H, s), 6.68 (1H, m), 6.77 (1H, m), 7.12 (1H, d).

1. waitAfter 16 hr
2. customthe reaction mixture was partitioned between ammonium chloride (30 ml of a saturated aqueous solution) and ethyl acetate
3. extractionThe aqueous layer was extracted with further ethyl acetate (2×30 ml)
4. washthe combined organic extracts were washed with brine (30 ml)
5. dry with materialdried over magnesium sulfate
6. customevaporated in vacuo
7. customThe crude residue was purified by flash column chromatography (SiO2, ethyl acetate/petrol, 4:1 v/v)