1,2-Dichloroethane → 6-(2-(3-((3,4-dichlorophenyl)amino)-1,2,4-oxadiazol-5-yl)ethyl)-1-(4-methoxybenzyl)-3,4-dihydroquinolin-2(1H)-one

Participants

Reaction Conditions

Reaction Steps

To a solution of 3-(1-(4-methoxybenzyl)-2-oxo-1,2,3,4-tetrahydroquinolin-6-yl)propanoic acid (200 mg, 0.589 mmol) in DMF (3 mL) were added HOBT (99 mg, 0.648 mmol), EDC (124 mg, 0.648 mmol), and DIPEA (0.154 mL, 0.884 mmol). The reaction mixture was stirred for 30 minutes, then (E)-1-(3,4-dichlorophenyl)-2-hydroxyguanidine (130 mg, 0.589 mmol) was added followed by sodium sulfate (419 mg, 2.95 mmol). The reaction mixture was heated at 110° C. for 12 h, then concentrated, diluted with water, and extracted with ethyl acetate. The organic layer was dried over sodium sulfate and concentrated. The crude product was purified by flash chromatography on silica gel using 10-100% EtOAc/hexane to give 6-(2-(3-((3,4-dichlorophenyl)amino)-1,2,4-oxadiazol-5-yl)ethyl)-1-(4-methoxybenzyl)-3,4-dihydroquinolin-2(1H)-one as a yellow solid (0.06 g, 11% yield). 1H NMR 400 MHz, DMSO-d6: δ 2.65-2.68 (m, 2H), 2.90 (t, J=15.20 Hz, 2H), 2.95 (t, J=12.40 Hz, 2H), 3.16 (t, J=15.20 Hz, 2H), 3.70 (s, 3H), 5.05 (s, 2H), 6.84-6.90 (m, 3H), 7.02-7.04 (m, 1H), 7.14-7.16 (m, 3H), 7.38-7.41 (m, 1H), 7.57 (d, J=8.80 Hz, 1H), 7.69 (s, 1H), 10.23 (s, 1H). LCMS (ES-API), RT: 2.20 min; m/z 523.0 [M−H]−.

Provenance & Evidence