[OH:1][C:2]1[CH:14]=[C:13]([N+:15]([O-:17])=[O:16])[CH:12]=[CH:11][C:3]=1[C:4]([O:6][C:7]([CH3:10])([CH3:9])[CH3:8])=[O:5].C(=O)([O-])[O-].[K+].[K+].I[CH2:25][CH3:26].O>CC(C)=O>[CH2:25]([O:1][C:2]1[CH:14]=[C:13]([N+:15]([O-:17])=[O:16])[CH:12]=[CH:11][C:3]=1[C:4]([O:6][C:7]([CH3:10])([CH3:9])[CH3:8])=[O:5])[CH3:26]To a solution of tert-butyl 2-hydroxy-4-nitrobenzoate (500 mg) obtained in Step A of Example 139 in acetone (5.0 mL) were added potassium carbonate (580 mg) and iodoethane (340 μL), and the mixture was stirred overnight with heating under reflux. To the reaction mixture was added water, and the mixture was extracted with ethyl acetate. The obtained organic layer was washed with saturated brine, and dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate) to give the title compound (550 mg).
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