[Br:1][C:2]1[CH:10]=[C:9]([N+:11]([O-:13])=[O:12])[C:8]([OH:14])=[C:7]2[C:3]=1[CH2:4][CH2:5][C:6]2=[O:15].N12CCCN=C1CCCC[CH2:17]2.IC.C(=O)([O-])O.[Na+]>CN(C)C=O>[Br:1][C:2]1[CH:10]=[C:9]([N+:11]([O-:13])=[O:12])[C:8]([O:14][CH3:17])=[C:7]2[C:3]=1[CH2:4][CH2:5][C:6]2=[O:15]4-Bromo-7-hydroxy-6-nitroindan-1-one (8.07 g, 29.7 mmol) and 1,8-diazabicyclo[5.4.0]undec-7-ene (5.33 mL, 35.6 mmol) were dissolved in N,N-dimethylformamide (150 mL), iodomethane (18.5 mL, 297 mmol) was added, and the mixture was stirred at room temperature for 40 hr. To the reaction solution was added saturated aqueous sodium hydrogencarbonate solution. The mixture was extracted with diethyl ether, washed with saturated brine and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (ethyl acetate/hexane=30/70→60/40) to give the title compound (6.70 g, yield 79%).
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