反应详情

温度

23 °C

A solution of piperidine in DMF (1:4, 5 mL) was added to the product of Step C (0.1 g, 0.2 mmol) and the solution was stirred for 5 minutes at 23° C., poured into aqueous NaHCO3, and extracted with ethyl acetate (2×20 mL). The combined extracts were dried (MgSO4) and concentrated to a residue, which was purified by chromatography (silica, gradient, 3 to 10% methanol in dichloromethane) to give an oil (0.035 g, 64%): 1H NMR (CDCl3) δ 8.27 (d, J=9.0 Hz, 1H), 8.01 (s, 1H), 7.64 (d, J=9.0 Hz, 1H), 7.41 (d, J=8.4 Hz, 1H), 7.34 (d, J=2.4 Hz, 1H), 7.26 (m, 1H), 4.76 (dd, J=14.4, 4.8 Hz, 1H), 4.63 (dd, J=14.4, 8.4 Hz, 1H), 3.96 (s, 3H), 3.67 (m, 1H), 1.25 (d, J=6.0 Hz, 3H); MS m/z 256 [M+H]+.

1. extractionextracted with ethyl acetate (2×20 mL)
2. dry with materialThe combined extracts were dried (MgSO4)
3. concentrationconcentrated to a residue, which
4. customwas purified by chromatography (silica, gradient, 3 to 10% methanol in dichloromethane)