反应详情

To a solution of 5-fluoro-2-nitrobiphenyl (0.86 mmol) in toluene/aq.KOH (2 mL/2 mL) are added 1-methylpiperidin-4-ol (1.1 mmol) and TBAB (0.17 mmol) at room temperature. After stirred at 70° C. overnight, the reaction mixture is diluted with AcOEt and water, and extracted with AcOEt (×2). The combined organic extracts are dried over Na2SO4, filtered, and concentrated in vacuo. The residue is purified by silica gel column chromatography (CH2Cl2:MeOH=10:1) to give 1-methyl-4-(6-nitrobiphenyl-3-yloxy)piperidine as a yellow solid. To a solution of 1-methyl-4-(6-nitrobiphenyl-3-yloxy)piperidine (0.63 mmol) in EtOH (5 mL) is added 5% palladium on activated carbon (50 mg) under N2 atmosphere. The reaction mixture is vigorously stirred at room temperature for 2.5 h under H2, and then filtered through celite (linsed with AcOEt). The filtrate is concentrated in vacuo to the title compound as a brown oil; 1H NMR (CDCl3), δ 1.79-1.87 (2H, m), 1.96-2.01 (2H, m), 2.25-2.31 (2H, m), 2.29 (3H, s), 2.70 (2H, brs), 3.52 (2H, m), 4.15-4.18 (1H, m), 6.70 (1H, d), 6.76-6.80 (2H, m), 7.32-7.38 (1H, m), 7.42-7.45 (4H, m).

1. filtrationfiltered through celite (linsed with AcOEt)
2. concentrationThe filtrate is concentrated in vacuo to the title compound as a brown oil