C[O-:2].[Na+].[N+](C)([O-])=O.Br[CH2:9][C:10]1[CH:19]=[CH:18][C:13]([C:14]([O:16][CH3:17])=[O:15])=[C:12]([O:20][CH3:21])[CH:11]=1>CO>[CH:9]([C:10]1[CH:19]=[CH:18][C:13]([C:14]([O:16][CH3:17])=[O:15])=[C:12]([O:20][CH3:21])[CH:11]=1)=[O:2]To a solution of sodium methoxide (0.260 g, 4.82 mmol) in methanol (200 mL) was added nitromethane (4.03 g, 11.58 mmol) under nitrogen atmosphere and the reaction mixture was stirred and reflux for 30 minutes. Methyl 4-(bromomethyl)-2-methoxybenzoate (10.00 g, 9.65 mmol) in methanol was added and the reaction mixture was refluxed for 7-8 h. The reaction mass was concentrated and diluted with CHCl3. The diluted reaction mass was washed with 2N NaOH solution. The organic layer was dried over anhydrous sodium sulphate and concentrated to afford 6.00 g of desired product. 1H NMR (300 MHz, DMSO d6): δ 3.83 (m, 6H), 7.36 (d, J=6.6 Hz, 2H), 7.79 (d, J=7.8 Hz, 1H), 10.04 (s, 1H).
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