反应详情

Into a 25 mL round bottom flask was added ethyl 1-((6-hydroxynaphthalen-2-yl)methyl)piperidine-4-carboxylate (313 mg, 0.1 mmol, 2 eq), 4-isopropylcyclohexanol (284 mg, 0.2 mmol, 2 eq), PPh3 (562 mg, 0.2 mmol, 2 eq) and dry toluene (0.5 mL) under N2. Then DIAD (404 mg, 0.2 mmol, 2 eq) was quickly added in one portion at room temperature. The reaction mixture was stirred at rt for 0.5 h. The solvent was removed under reduced pressure and the residue was purified by silica gel column chromatography (PE:EA=4:1) to give ethyl 1-((6-(4-isopropylcyclohexyloxy)naphthalen-2-yl)methyl)piperidine-4-carboxylate (213 mg, yield: 51%) as slight yellow oil. ESI-MS (M+1)+: 438.1. 1H NMR (400 MHz, CDCl3) δ: 7.64-7.57 (m, 3H), 7.36 (d, J=8.4 Hz, 1H), 7.10-7.08 (m, 2H), 4.60-4.58 (m, 1H), 4.05 (q, J=7.2 Hz, 2H), 3.56 (s, 2H), 2.85-2.81 (m, 2H), 2.07-2.04 (m, 1H), 2.01-1.97 (m, 2H), 1.83-1.71 (m, 4H), 1.51-1.40 (m, 6H), 1.24-1.15 (m, 6H), 1.11-1.06 (m, 1H), 0.83 (d, J=6.4 Hz, 6H).

1. customThe solvent was removed under reduced pressure
2. customthe residue was purified by silica gel column chromatography (PE:EA=4:1)