反应详情

To a round bottomed flask equipped was added sodium hydride (40 mg, 60% dispersion in mineral oil) and 1, 2-dimethoxyethane (10 ml). Diethyl cyanomethylphosphonate (102 μl, 0.95 mmol) was added and the reaction mixture allowed to warm to room temperature. 4-[(2,4-Bis(methoxymethoxy)phenyl)]cyclohexanone (200 mg) was added as a solution in 1,2-dimethoxyethane (10 ml) and the reaction mixture stirred for 17 hr at room temperature. The reaction mixture was poured into a separating funnel containing water (50 ml) and diethyl ether (50 ml). The layers were separated and the aqueous phase extracted with diethyl ether (2×20 ml). The combined organic layers were washed with brine (20 ml), dried over magnesium sulfate, filtered and concentrated in vacuo, to give an oil. Purification via flash column chromatography (SiO2, ethyl acetate/petroleum ether, 1:2, v/v) afforded the title compound (141 mg, 66%) as a pale yellow oil. δH (CD3OD) 1.57-1.70 (2H, m), 2.02-2.25 (2H, m), 2.34-2.49 (2H, m), 2.60 (1H, m), 3.03 (1H, m), 3.24 (1H, m), 3.47 (3H, s), 3.52 (3H, s), 5.17 (2H, s), 5.23(2H, s), 5.33 (1H, s), 6.68 (1H, dd), 6.83 (1H, d), 7.09 (1H, d).

1. customTo a round bottomed flask equipped
2. additionThe reaction mixture was poured into a separating funnel
3. customThe layers were separated
4. extractionthe aqueous phase extracted with diethyl ether (2×20 ml)
5. washThe combined organic layers were washed with brine (20 ml)
6. dry with materialdried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customto give an oil
10. customPurification via flash column chromatography (SiO2, ethyl acetate/petroleum ether, 1:2, v/v)