Acetyl chloride → N-[2-(hydroxymethyl)-1H-indol-5-yl]acetamide

Participants

Reaction Steps

To a solution of 14 (200 mg, 1.25 mmol), dimethylaminopyridine (20 mg) and triethylamine (0.94 mL) in THF cooled to 0° C. was added a solution of acetyl chloride (0.30 mL, 4.16 mmol) in THF (5 mL) dropwise. The reaction mixture was allowed to warm up to room temperature and stirred for 3 h. THF was removed in vacuo and ethyl acetate (40 mL) was added. The solution was washed with water (20 mL×2). The solution was dried using sodium sulfate and solvent was removed in vacuo. The residue was dissolved in methanol (5 mL) and 3N NaOH solution(1 mL) was added. The reacted was allowed to proceed overnight. The reaction mixture was evaporated and water (10 mL) was added. The product was extracted with ethyl acetate (30 mL×3) and the solvent was removed in vacuo. The product was crystallized in acetate and washed with ether. 128 mg (50% yield) of grew powder 15 was obtained. mp: 161° C. 1H NMR (DMSO-d6, ppm): 10.84 (s, 1 H, NH), 9.62 (s, 1 H, NH), 7.75 (d, 1 H, J=2.1 Hz, Ar--H), 7.22-7.10 (m, 2 H, Ar--H), 6.20 (s, 1 H, Ar--H), 6.43-6.40 (dd, 1 H, J=2.4, 8.5 Hz, Ar--H), 5 5.18-5.15 (t, 1 H, J=5.5 Hz, OH), 4.57-4.56 (d, 2 H, J=5.4 Hz, CH2OH), 2.01 (s, 3 H, CH3), Anal. (C11H12N2O2), C, H, N.

Provenance & Evidence