4-Nitrophenol → 1-{2-[2-(2-Methoxyethoxy)ethoxy]ethoxy}-4-nitrobenzene

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To a stirred solution of 16 (1.83 g, 5.75 mmol) in anhydrous DMF (10 mL) were added K2CO3 (2.39 g, 17.3 mmol) and 4-nitrophenol (0.78 g, 5.59 mmol), and the reaction mixture was heated to 80° C. for 16 h. After cooling, the mixture was diluted in water, extracted three times with DCM, and then dried over MgSO4. The filtrate was concentrated under reduced pressure to give an oily residue, which was purified by flash chromatography over silica gel with Hex/EtOAc (1:2) to afford 17 as a yellow oil (1.51 g, 92%): 1H NMR (500 MHz, CDCl3) δ 8.19 (d, J=9.1 Hz, 2H), 6.97 (d, J=9.1 Hz, 2H), 4.26-3.65 (m, 12H), 3.37 (s, 3H).

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