反应详情

Sodium hydroxide (0.01 g, 0.23 mmol) was added to a solution of 3-{5-[2-(5,6,7,8-tetrahydro-[1,8]naphthyridin-2-yl)-ethoxy]-indol-1-yl}-hexanoic acid ethyl ester (0.02 g, 0.04 mmol) in methanol/water (9/1, 1 mL) and stirred overnight. The reaction was acidified to pH 6 with 1N HCl and the crude product was extracted with ethyl acetate (3×10 mL) and concentrated. The residue was purified by flash chromatography on silica gel (10% methanol in ethyl acetate) to give the title compound (28% yield). 1H NMR (CDCl3) δ 10.4 (bs, 1H), 7.38 (d, 1H, J=8.0 Hz), 7.21 (d, 1H, J=3.2 Hz), 7.14 (d, 1H, J=8.0 Hz), 7.00 (d, 1H, J=2.3 Hz), 6.73 (m, 1H), 6.48 (d, 1H, J=7.3 Hz), 6.32 (d, 2H, J=3.0 Hz), 4.80 (s, 1H), 4.22 (t, 2H, J=7.0 Hz), 3.47 (m, 2H), 2.95 (t, 2H, J=6.8 Hz), 2.68 (m, 4H), 1.88 (m, 4H), 1.15 (m, 2H), 0.81 (t, 3H, J=7.4 Hz). Mass Spectrum (LCMS, ESI) calculated for C24H30N3O3 408.2 (M+H); found 408.3.

1. extractionthe crude product was extracted with ethyl acetate (3×10 mL)
2. concentrationconcentrated
3. customThe residue was purified by flash chromatography on silica gel (10% methanol in ethyl acetate)