1-Hydroxybenzotriazole → N-carbamoylmethyl-1'-[(1-cyclopropyl-4-ethoxy-1H-indol-6-yl)carbonyl]-4-oxo-spiro[chroman-2,4'-piperidine]-6-carboxamide

Participants

Reaction Conditions

Reaction Steps

N-Carbamoylmethyl-4-oxospiro[chroman-2,4′-piperidine]-6-carboxamide hydrochloride (389 mg), 1-cyclopropyl-4-ethoxy-1H-indole-6-carboxylic acid (245 mg), WSC hydrochloride (230 mg), HOBT (183 mg) and triethylamine (0.209 mL) were suspended in DMF (8 mL), and the mixture was stirred at 80° C. for 1.5 hours. The reaction mixture was allowed to cool to room temperature, diluted with ethyl acetate, and washed successively with water, 1 N hydrochloric acid, aqueous saturated sodium bicarbonate and saturated saline water. The organic layer was dried over sodium sulfate, filtered, concentrated, and purified through silica gel column chromatography (chloroform/methanol) to afford the title compound as a colorless amorphous substance. 1H-NMR (400 MHz, DMSO-d6) δ: 8.78-8.71 (1H, m), 8.32-8.30 (1H, m), 8.08 (1H, dd, J=8.7, 2.3 Hz), 7.34 (1H, s), 7.28 (1H, d, J=3.4 Hz), 7.22-7.16 (2H, m), 6.99 (1H, s), 6.56 (1H, s), 6.38 (1H, d, J=3.4 Hz), 4.27-4.15 (1H, br m), 4.15 (2H, q, J=7.0 Hz), 3.77 (2H, d, J=5.9 Hz), 3.46-3.25 (3H, br m), 3.45-3.39 (1H, m), 2.95 (2H, s), 2.09-1.75 (4H, br m), 1.38 (3H, t, J=7.0 Hz), 1.08-1.01 (2H, m), 0.95-0.90 (2H, m); MS [M+H]+=545.

Provenance & Evidence