反应详情

Dissolve 1-(2-methoxy-4-nitro-phenyl)-piperidin-4-ol (1.19 g, 4.72 mmol) in DMF (25 mL), followed by addition of triisopropylsilyl-trifluoromethanesulfonate (1.50 mL, 5.56 mmol) and Et3N (0.80 mL, 5.87 mmol). Stir the solution at room temperature for 2 h, then add water (50 mL) and extract with EtOAc (2×50 mL). Combine the organic solutions and wash with water (2×30 mL) and brine (30 mL), then dry, filter, and concentrate. Purify the crude material by flash chromatography, using a linear gradient of 100% hexanes to 20% EtOAc/hexanes, to give the title compound as a yellow solid (1.55 g, 80%). MS (ES+) 409.3 (M+1)+. 1H NMR (400 MHz, CDCl3) δ: 7.84 (dd, 1H, J=8.8, 2.6 Hz), 7.68 (d, 1H, J=2.6 Hz), 6.89 (d, 1H, J=8.8 Hz), 4.07-4.01 (m, 1H), 3.93 (s, 3H), 3.45-3.38 (m, 2H), 3.13-3.06 (m, 2H), 1.99-1.91 (m, 2H), 1.81-1.73 (m, 2H), 1.07-1.06 (m, 21H).

1. extractionadd water (50 mL) and extract with EtOAc (2×50 mL)
2. washCombine the organic solutions and wash with water (2×30 mL) and brine (30 mL)
3. customdry
4. filtrationfilter
5. concentrationconcentrate
6. customPurify the crude material by flash chromatography