Hydrochloric Acid → 2-(5-Chloro-3-methyl-2-pyridin-3-yl-indol-1-yl)-ethanol

Participants

Reaction Conditions

Reaction Steps

A flask is charged with 5-chloro-3-methyl-2-pyridin-3-yl-1H-indole hydrochloride (Example 2, 1.0 g, 3.58 mmol) and THF (20 mL) and cooled to 0° C. KHMDS (0.5 M in toluene, 17.9 mL, 8.95 mmol) is added and the mixture is stirred at room temperature for 30 min, followed by addition of (2-chloro-ethoxy)-trimethylsilane (1.06 mL, 8.95 mmol). The reaction mixture is stirred for 48 h at 60° C. After cooling to room temperature, aqueous 1M HCl (30 mL) is added and the mixture is stirred at room temperature for 30 min, then washed with water and extracted with ethyl acetate twice. The organic layer is dried over sodium sulfate and concentrated in vacuo. The residue is purified by silica gel flash chromatography (heptane-ethyl acetate, 1:4) to afford 2-(5-chloro-3-methyl-2-pyridin-3-yl-indol-1-yl)-ethanol as a solid. 1H NMR (400 MHz, MeOD) δ ppm 2.22 (s, 3H), 3.69 (t, J=5.9 Hz, 2H), 4.18 (t, J=5.8 Hz, 2H), 7.21 (dd, J=8.6, 2.0 Hz, 1H), 7.47 (d, J=8.6 Hz, 1H), 7.57 (d, J=1.8 Hz, 1H), 7.61-7.67 (m, 1H), 8.01 (dt, J=7.9, 2.0 Hz, 1H), 8.61-8.71 (m, 2H). HRMS (ESI) m/z 287.0953 [(M+H)+ Calcd for C16H16ClN2O: 287.0951].

Provenance & Evidence