反应详情

trans/cis-4-(2,4-Bis{[tert-butyl(dimethyl)silyl]oxy}phenyl)cyclohexylamine (27 mg) was dissolved in pyridine (0.5 ml). Acetyl chloride (6 μl) and 4-dimethylaminopyridine (2 mg) were added sequentially and the reaction mixture stirred for 24 hr. The solvent was removed in vacuo and the residue partitioned between ethyl acetate (10 ml) and water (2 ml). The aqueous phase was extracted with ethyl acetate (2×5 ml) and the combined organic phases were washed with brine (10 ml), dried over anhydrous magnesium sulphate, and concentrated to give a brown oil. Purification via flash column chromatography (SiO2 eluting with ethyl acetate:petroleum ether, 7:3 v/v) afforded the title product as a white solid (15 mg, 50%) and a mixture of diastereoisomers. δH (CDCl3): 0.17 (3H, s), 0.19 (3H, s), 0.21 (3H, s), 0.22 (3H, s), 0.96 (9H, s), 1.02 (9H, s), 1.06-1.20 (2H, m), 1.36-1.54 (2H, m), 1.60-1.75 (2H, m), 1.80-1.92 (2H, m), 1.95 (1.5H, s), 2.00 (1.5H, s), 2.75-2.90 (1H, m), 3.76-3.87 (1H, m), 5.34-5.39 (0.5H, d), 5.72-5.77 (0.5H, d), 6.26-6.29 (1H, m), 6.38-6.41 (1H, m), 6.93 (0.5H, d), 6.95 (0.5H, d); m/z (ES+) 478 (M+1)+.

1. customThe solvent was removed in vacuo
2. customthe residue partitioned between ethyl acetate (10 ml) and water (2 ml)
3. extractionThe aqueous phase was extracted with ethyl acetate (2×5 ml)
4. washthe combined organic phases were washed with brine (10 ml)
5. dry with materialdried over anhydrous magnesium sulphate
6. concentrationconcentrated
7. customto give a brown oil
8. customPurification via flash column chromatography (SiO2 eluting with ethyl acetate:petroleum ether, 7:3 v/v)