[CH3:1][C:2]1[C:11](=[O:12])[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][C:9]=2[N+:13]([O-:15])=[O:14])[NH:4][CH:3]=1.CC1C(=O)C2C(=CC([N+]([O-])=O)=CC=2)NC=1.C(=O)([O-])[O-].[Cs+].[Cs+].Br[CH2:38][C:39]([O:41][CH2:42][CH3:43])=[O:40]>C1(C)C=CC=CC=1>[CH2:42]([O:41][C:39](=[O:40])[CH2:38][N:4]1[C:5]2[C:10](=[C:9]([N+:13]([O-:15])=[O:14])[CH:8]=[CH:7][CH:6]=2)[C:11](=[O:12])[C:2]([CH3:1])=[CH:3]1)[CH3:43]A suspension of 3-methyl-5-nitroquinolin-4(1H)-one and 3-methyl-7-nitroquinolin-4(1H)-one (Eur. J. Med. Chem. 1997, 32, 547, 500 mg, 2.45 mmol,) and cesium carbonate (800 mg (2.45 mmol) in toluene (50 mL) was treated with ethyl bromoacetate (0.3 mL, 2.45 mmol) and stirred at RT for 3 days. The solid (Cesium salt of starting materials) was filtered and washed with dichloromethane. The filtrate was concentrated to give 400 mg of the crude material which was purified using flash column chromatography (DCM:MeOH, 99:1) to isolate the desired region-isomer: 100 mg 1H NMR (CDCl3, 300 MHz): δ 1.3 (m, 3H, J=7.2 Hz), 2.08 (s, 3H), 4.25 (q, 2H, J=7.2 Hz), 4.8 (s, 2H), 7.3 (m, 2H), 7.4 (s, 1H), 7.65 (t, J=8 Hz, 1H). The other isomer was also recovered: 70 mg.
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