Trifluoroacetic acid → HCID 86703327, compound

Participants

Reaction Steps

To a solution of 6-methoxy-5-methyl-2-(1-methylcyclopropyl)-1H-indole (586 mg) and methyl 6-formylpyridine-2-carboxylate (450 mg) in dichloromethane (13.6 mL) was added triethylsilane (1.30 mL) under ice-cooling. Trifluoroacetic acid (0.313 mL) was added dropwise thereto, and the mixture was stirred under ice-cooling for 30 minutes and then at room temperature for 3 hours. The reaction mixture was diluted with ethyl acetate and washed with a saturated aqueous sodium hydrogen carbonate solution. The organic layer was washed with saturated brine, dried over anhydrous sodium sulfate, and then concentrated under reduced pressure. The residue was suspended in methanol. The precipitate was collected by filtration, washed with methanol, and then dried under reduced pressure at 40° C. to obtain the title compound (688 mg). 1H-NMR (CDCl3) δ ppm: 0.66-0.72 (2H, m), 0.80-0.86 (2H, m), 1.31 (3H, s), 2.19 (3H, s), 3.84 (3H, s), 4.05 (3H, s), 4.48 (2H, s), 6.78 (1H, s), 7.00 (1H, s), 7.04-7.10 (1H, m), 7.59 (1H, t, J=7.8 Hz), 7.79 (1H, br s), 7.91-7.97 (1H, m). ESI-MS (m/z): 365 (M+H)+

Provenance & Evidence