反应详情

温度

60 °C

To a solution of 4-[5-(2-cyclopentyl-6-methoxy-pyridin-4-yl)-[1,2,4]oxadiazol-3-yl]-2-ethyl-6-methyl-phenol (1.26 g, 3.32 mmol) in DMF (20 mL), Cs2CO3 (6.49 g, 19.9 mmol) is added. The mixture is stirred at rt for 10 min before 2-bromoethanol (2.07 g, 16.6 mmol) is added. The mixture is stirred at 60° C. for 5 days. The mixture is cooled to rt, diluted with sat. aq. NaHCO3 solution (50 mL) and extracted twice with EA (2×200 mL). The org. extracts are combined and concentrated. The crude product is purified by CC on silica gel eluting with heptane:EA 4:1 to give 2-(4-(5-(2-cyclopentyl-6-methoxypyridin-4-yl)-1,2,4-oxadiazol-3-yl)-2-ethyl-6-methylphenoxy)ethanol (639 mg) as a pale yellow oil; 1H NMR (CDCl3): δ: 7.90 (s, 1H), 7.88 (s, 1H), 7.51 (s, 1H), 7.31 (s, 1H), 4.02 (s, 3H), 3.97-4.01 (m, 4H), 3.21-3.29 (m, 1H), 2.79 (q, J=7.6 Hz, 2H), 2.42 (s, 3H), 2.15 (t, J=5.5 Hz, 1H), 2.06-2.14 (m, 2H), 1.83-1.95 (m, 4H), 1.68-1.80 (m, 2H), 1.33 (t, J=7.6 Hz, 3H).

1. additionis added
2. temperatureThe mixture is cooled to rt
3. extractionextracted twice with EA (2×200 mL)
4. concentrationconcentrated
5. customThe crude product is purified by CC on silica gel eluting with heptane:EA 4:1