反应详情

To a degassed solution of [4-(4-{[N,N-bis-(2-hydroxyethyl)carbamoyl]methoxy}phenyl)-butyl]carbamic acid benzyl ester 25 (0.19 g, 0.43 mmol) in ethanol (4 mL) was added 10% palladium on activated carbon (0.1 g, 50% wet). The mixture was hydrogenated overnight at atmospheric hydrogen. The catalyst was filtered through a pad of diatomaceous earth and the solvent was evaporated in vacuo. The residue was purified by flash chromatography (silica gel, 20-5:1:0.1-1 dichloromethane/methanol/concentrated ammonium hydroxide, v/v) to provide 26 (0.09 g, 72%) as a colorless oil. 1H NMR (300 MHz, CD3OD) δ 1.56 (m, 4H), 2.56 (t, 2H), 2.65 (t, 1H), 3.29 (m, 1H), 3.55 (m, 4H), 3.72 (m, 4H), 4.90 (s, 2H), 6.86 (d, 2H), 7.09 (d, 2H). m/z (ESI): 311 [C16H26N2O4+H]+.

1. filtrationThe catalyst was filtered through a pad of diatomaceous earth
2. customthe solvent was evaporated in vacuo
3. customThe residue was purified by flash chromatography (silica gel, 20-5:1:0.1-1 dichloromethane/methanol/concentrated ammonium hydroxide, v/v)