反应详情

To a flask equipped with magnetic stirrer was added N-benzyl-N-[4-(2,4-bis{[tert-butyl(dimethyl)silyl]oxy}phenyl)cyclohexylidene]amine (4.00 g, 7.63 mmol) and tetrahydrofuran (480 ml) followed by methanol (120 ml). To the solution was added sodium borohydride (1.16 g, 30.5 mmol) and the reaction mixture stirred for 17 hr. The reaction mixture was then diluted with diethyl ether (600 ml) and aqueous sodium hydroxide (400 ml, 0.4 M) was added. After stirring for 10 min, the layers were separated and the aqueous layer extracted with dichloromethane (3×100 ml). The combined organic phases were washed with brine (50 ml), dried over magnesium sulfate and concentrated in vacuo. Purification via FCC (SiO2, ethyl acetate/petroleum ether, gradient elution using 1:9, 1:4, then 3:7, v/v) furnished the title compound as a cream solid (2.09 g, 54%). δH(CDCl3) 0.01 (6H, s), 0.05 (6H, s), 0.80 (9H, s), 0.85 (9H, s), 1.18 (4H, m), 1.66 (2H, m), 1.87 (2H, m), 2.19 (1H, m), 2.68 (1H, M), 6.12 (1H, d), 6.23 (1H, dd), 6.77 (1H, d), 7.17 (5H, m).

1. customTo a flask equipped with magnetic stirrer
2. additionwas added
3. stirringAfter stirring for 10 min
4. customthe layers were separated
5. extractionthe aqueous layer extracted with dichloromethane (3×100 ml)
6. washThe combined organic phases were washed with brine (50 ml)
7. dry with materialdried over magnesium sulfate
8. concentrationconcentrated in vacuo
9. customPurification via FCC (
10. washSiO2, ethyl acetate/petroleum ether, gradient elution