1,2-Dichloroethane → 6-((3-(3,4-dichlorophenylamino)-1,2,4-oxadiazol-5-yl)methoxy)-3,4-dihydroquinolin-2(1H)-one

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 2-(2-oxo-1,2,3,4-tetrahydroquinolin-6-yloxy)acetic acid (0.15 g, 0.67 mmol) were added HOBt (0.1 g, 0.74 mmol), EDC (0.15 g, 0.74 mmol) and DIPEA (0.22 g, 1.69 mmol). The resulting reaction mixture was stirred at room temperature for 30 min. (E)-1-(3,4-dichlorophenyl)-2-hydroxyguanidine (0.15 g, 0.67 mmol) in DMF was added to the above reaction mixture followed by sodium sulfate (0.48 g, 3.39 mmol) and the reaction mixture was heated at 110° C. for 12 h. The reaction mixture was concentrated under reduced pressure. Water was added and the mixture was extracted with ethyl acetate. The combined organic layer was dried over sodium sulfate and concentrated. Purification was by preparative HPLC to give 6-((3-(3,4-dichlorophenylamino)-1,2,4-oxadiazol-5-yl)methoxy)-3,4-dihydroquinolin-2(1H)-one (9.3 mg, 7%). 1HNMR: 400 MHz, DMSO-d6: δ 2.42 (q, J=7.20 Hz, 2H), 2.85 (t, J=7.60 Hz, 2H), 5.41 (s, 2H), 6.78-6.87 (m, 2H), 6.94 (d, J=2.40 Hz, 1H), 7.41 (dd, J=2.80, 8.80 Hz, 1H), 7.59 (d, J=8.80 Hz, 1H), 7.71 (d, J=2.80 Hz, 1H), 9.96 (s, 1H), 10.39 (s, 1H). LCMS, RT 1.880 min; LCMS (ES-API), m/z 405.1.

Provenance & Evidence