反应详情

To a solution of 4-{7-(cyclopentylamino)-3-[2-(cyclopentylamino)-4-pyrimidinyl]pyrazolo[1,5-a]pyridin-2-yl}phenol (100 mg, 0.22 mmol) in acetone (10 mL) was added ethyl α-bromoacetate (49 μL, 0.44 mmol) and potassium carbonate (304 mg, 2.2 mmol). The mixture was heated to reflux for 3 hours. The reaction mixture was cooled to room temperature and water was added. The solution was extracted with ethyl acetate. The organics were dried (magnesium sulfate), filtered and concentrated, followed by purification with flash chromatography (1:1 ethyl acetate:hexanes) to give ethyl (4-{7-(cyclopentylamino)-3-[2-(cyclopentylamino)-4-pyrimidinyl]pyrazolo[1,5-a]pyridin-2-yl}phenoxy)acetate (85 mg, 71%) as a brown oil. 1H NMR (CDCl3): δ 7.94 (d, 1H), 7.70 (d, 1H), 7.55 (d, 2H), 7.23 (t, 1H), 6.95 (d, 2H), 6.25 (d, 1H), 5.98–5.95 (m, 2H), 5.13 (d, 1H), 4.62 (s, 2H), 4.31–4.21 (m, 3H), 3.94 (m, 1H), 2.07–1.99 (m, 4H), 1.75–1.46 (m, 12H), 1.28 (t, 3H); MS m/z 541 (M+1).

1. temperatureThe mixture was heated
2. temperatureto reflux for 3 hours
3. extractionThe solution was extracted with ethyl acetate
4. dry with materialThe organics were dried (magnesium sulfate)
5. filtrationfiltered
6. concentrationconcentrated
7. customfollowed by purification with flash chromatography (1:1 ethyl acetate:hexanes)