[CH:1]1([CH2:4][O:5][C:6]2[CH:7]=[C:8]([CH2:15][C:16]([O:18][CH2:19][CH3:20])=[O:17])[CH:9]=[CH:10][C:11]=2[N+:12]([O-:14])=[O:13])[CH2:3][CH2:2]1.[H-].[Na+].Br[CH2:24][CH2:25][CH2:26][CH2:27]Br.[NH4+].[Cl-]>CN(C=O)C>[CH:1]1([CH2:4][O:5][C:6]2[CH:7]=[C:8]([C:15]3([C:16]([O:18][CH2:19][CH3:20])=[O:17])[CH2:27][CH2:26][CH2:25][CH2:24]3)[CH:9]=[CH:10][C:11]=2[N+:12]([O-:14])=[O:13])[CH2:2][CH2:3]1Ethyl 2-(3-(cyclopropylmethoxy)-4-nitrophenyl)acetate (0.5 g) was dissolved in 10 mL anhydrous DMF and NaH (60% wt. in oil, 0.13 g, mmol) was added at 0° C. The reaction mixture was stirred for 0.5 h at 25° C. and 1,4-dibromobutane (0.24 g, mmol) was added drop wise at 0° C. The reaction mixture was stirred at 0° C. for 1 h and saturated NH4Cl solution (10 mL) was added. The reaction mixture was extracted with EtOAc (3×20 mL) and the combined organic phases were washed with water (3×20 mL) and brine (20 mL), and dried over MgSO4, filtered and concentrated under reduced pressure to give ethyl 1-(3-(cyclopropylmethoxy)-4-nitrophenyl)cyclopentanecarboxylate (380 mg) as a colorless oil.
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