2-Aminoquinoline → 2-(2,6-dichlorophenyl)-1H-indole-6-carboxylic acid quinolin-2-ylamide

Participants

Reaction Conditions

Reaction Steps

To 10 mL of ice-cold toluene was added 844 μL of 2 M trimethylaluminum in toluene then 2-aminoquinoline (233 mg, 1.62 mmol) was added in one portion and the mixture was stirred for 25 min. To this was added a solution of methyl 2-(2,6-dichlorophenyl)-1H-indole-6-carboxylate (470 mg, 1.47 mmol) (from Example 3-5) in toluene (7 mL) dropwise and the resulting solution was heated at 100° C. for 18 h. A second aliquot of trimethylaluminum was added and the mixture heated another 18 h, after which it was cooled to ambient temperature, quenched with 1N HCl, and basified by stirring with 8% NaHCO3. This mixture was filtered, and the filtrate separated. The aqueous layer was re-extracted with ethyl acetate, and the combined organic layers were dried, filtered, and the solvent was removed under reduced pressure. The residue was chromatographed using a gradient of 20-50% heptane/ethyl acetate to give 2-(2,6-dichlorophenyl)-1H-indole-6-carboxylic acid quinolin-2-ylamide. 1H NMR (DMSO-d6, 400 MHz) δ 11.85 (s, 1H), 11.06 (s, 1H), 8.40 (s, 2H), 8.22 (s, 1H), 7.96 (d, J=8.8 Hz, 1H), 7.89 (d, J=8.3 Hz, 1H), 7.81 (dd, J=8.3, 1.5 Hz, 1H), 7.74 (td, J=6.8, 1.5 Hz, 1H), 7.70 (d, J=8.6 Hz, 1H), 7.88 (s, 1H), 7.66 (s, 1H), 7.53 (m, 2H), 6.62 (s, 1H). MS (m/z) 432.0 (M+1); retention time=1.57 min (Method 10).

Provenance & Evidence