反应详情

To a solution of ethyl 5-cyclobutyl-3-(2,6-dichlorophenyl)-4-isoxazolecarboxylate (1.52 g, 4.47 mmol) in THF (20 mL) at 0° C. was slowly added a 1.5 M solution of diisobutylaluminum hydride in toluene (6.26 mL, 9.39 mmol). The solution was allowed to warm slowly to ambient temperature. After approximately 4 hr of stirring, the solution was re-cooled to 0° C. and an additional 6 mL of diisobutylaluminum hydride was added. After approximately 1.5 hr of stirring the mixture was re-cooled to 0° C., quenched with aqueous Rochelle's salt and allowed to stir overnight while warming to ambient temperature. The mixture was extracted twice with ethyl acetate. The combined organic layers were washed with Rochelle's salt followed by with brine and then dried over magnesium sulfate and concentrated to afford [5-cyclobutyl-3-(2,6-dichlorophenyl)-4-isoxazolyl]methanol (1.30 g, 98%). 1H-NMR (400 MHz, DMSO-d6) δ 7.61-7.51 (m, 3H), 4.87 (t, J=5 Hz, 1H), 4.10 (d, J=5 Hz, 2H), 3.91-3.83 (m, 1H), 2.42-2.28 (m, 4H), 2.08-1.98 (m, 1H), 1.94-1.84 (m, 1H).

1. temperaturethe solution was re-cooled to 0° C.
2. stirringAfter approximately 1.5 hr of stirring the mixture
3. temperaturewas re-cooled to 0° C.
4. customquenched with aqueous Rochelle's salt
5. stirringto stir overnight
6. temperaturewhile warming to ambient temperature
7. extractionThe mixture was extracted twice with ethyl acetate
8. washThe combined organic layers were washed with Rochelle's salt
9. dry with materialdried over magnesium sulfate
10. concentrationconcentrated