反应详情

温度

90 °C

To a suspension of 2-(2-methoxy-4-nitro-phenyl)-5-(5-methyl-3-phenyl-isoxazol-4-yl)-[1,3,4]oxadiazole (200 mg, 0.53 mmol) in ethanol (2 mL) was added iron powder (148 mg, 2.64 mmol) and aqueous HCl (1 M, 0.53 mL, 0.53 mmol). The reaction mixture was stirred for 2 h at 90° C., cooled to ambient temperature and poured onto an aqueous solution of sodium carbonate (saturated, 20 mL) and ethyl acetate (20 mL) and then stirred for 1 h. Filtration over Hyflo® was followed by washing of the Hyflo® with ethyl acetate. The aqueous phase was extracted with ethyl acetate (20 mL). Drying over sodium sulfate, concentration and purification by chromatography (SiO2, heptane:ethyl acetate=50:50 to 0:100) afforded the title compound (80 mg, 43%) as a white solid. MS: m/e=349.2 [M+H]+.

1. temperaturecooled to ambient temperature
2. stirringstirred for 1 h
3. filtrationFiltration over Hyflo®
4. washby washing of the Hyflo® with ethyl acetate
5. extractionThe aqueous phase was extracted with ethyl acetate (20 mL)
6. dry with materialDrying over sodium sulfate, concentration and purification by chromatography (SiO2, heptane:ethyl acetate=50:50 to 0:100)