5-Benzyloxyindole → 5-Benzyloxy-indol-1-yl-propionic acid methyl ester

Participants

Reaction Steps

To a solution of 5-benzyloxyindole (13.5 g, 60.46 mmol) in DMF (300 mL) was added sodium hydride (60% dispersion in mineral oil, 3.63 g, 90.7 mmol). The resulting suspension was stirred at rt for 1 h after which methyl 2-bromopropionate (11.1 g, 66.51 mmol) was added. The resulting suspension was stirred at rt for 6 h. The reaction mixture was quenched with sat. aqueous ammonium chloride solution (25 mL), and diluted with 200 mL of EtOAc. The organic layer was washed with water three times. The aqueous layer was extracted again with EtOAc. The combined organic layers were dried over magnesium sulfate, filtered, and concentrated via rotary evaporation. The resulting brown oil was purified on silica gel (EtOAc/hexanes 1:1) to give the title compound as a brownish oil (15.3 g, 82%). LC/MS m/z 310 (M+H)+, RT 4.04 min. 1H NMR (400 MHz, Acetone-d6) δ 7.57 (d, 2H), 7.23-7.41 (m, 5H), 7.19 (d, 1H), 6.84 (d, 1H), 6.40 (d, 1H), 5.37 (q, 1H), 5.17 (s, 2H), 3.66 (s, 3H), 1.79 (d, 3H).

Provenance & Evidence