反应详情

To a solution of 3β-hydroxyandrostane-6,17-dione (0.40 g) in THF (8 mL), N-(9-fluorenylmethoxycarbonyl)glycine (0.43 g), N,N′-dicyclohexylcarbodiimide (0.32 g) and 4-dimethylaminopyridine (16 mg) were added and the reaction mixture was stirred at room temperature for 1 h. After evaporation to dryness, the residue was purified by flash chromatography (SiO2; EtOAc:n-hexane 6:4) to give 3β-{2-[N-(9-fluorenylmethoxycarbonyl)]aminoacetoxy}androstane-6,17-dione (0.73 mg, 95%). 1H-NMR (300 MHz, acetone, ppm from TMS): δ 7.93-7.30 (8H, m), 6.86 (1H, t), 4.71 (1H, m), 4.40-4.20 (3H, m), 3.91 (2H, d), 2.55-1.25 (20H, m), 0.87 (3H, s), 0.78 (3H, s).

1. customAfter evaporation to dryness
2. customthe residue was purified by flash chromatography (SiO2; EtOAc:n-hexane 6:4)