反应详情

A solution of 5-benzyloxyindole (5.00 g, 22.4 mmol) in DMF (20 mL) was added dropwise to a stirred solution of sodium hydride (0.91 g, 38.1 mmol) in DMF (50 mL) at 0° C. and stirred for 20 minutes. Ethyl-β-bromocaproate (5.59 g, 26.9 mmol) in DMF (20 mL) was added and the reaction was stirred at room temperature overnight. The reaction was then poured into cold H2O (150 mL) and extracted with ethyl acetate (3×50 mL), dried over magnesium sulfate and concentrated. The residue was purified by flash chromatography on silica gel (40% ethyl acetate in hexane) to give the title compound as oil (40% yield). 1H NMR (CDCl3) δ 7.47 (d, 2H, J=7.2 Hz), 7.38 (t, 2H, J=7.1 Hz), 7.32 (d, 2H, J=8.8 Hz), 7.12 (dd, 2H, J=2.4, 13.7 Hz), 6.94 (dd, 1H, J=2.4, 10.2 Hz), 6.44 (d, 1H, J=3.1 Hz), 5.09 (s, 2H), 4.79 (m, 1H), 3.98 (q, 2H, J=7.1 Hz), 2.80 (m, 2H), 1.90 (m, 2H), 1.25 (m, 2H), 1.07 (t, 3H, J=7.2 Hz), 0.86 (t, 3H, J=7.3 Hz).

1. stirringthe reaction was stirred at room temperature overnight
2. extractionextracted with ethyl acetate (3×50 mL)
3. dry with materialdried over magnesium sulfate
4. concentrationconcentrated
5. customThe residue was purified by flash chromatography on silica gel (40% ethyl acetate in hexane)