反应详情

温度

25 °C

A solution of 2-(3-chloro-4-methanesulfonyl-phenyl)-3-(3-oxo-cyclopentyl)-N-pyrazin-2-yl-propionamide (prepared as in Example 45, 73.5 mg, 0.17 mmol) and methoxyamine hydrochloride (21.8 mg, 0.26 mmol) in methanol (512 μL) and pyridine (512 μL) was heated under reflux for 5 h. The reaction mixture was allowed to cool to 25° C. and was then concentrated in vacuo. The resulting residue was diluted with water (50 mL) and extracted with ethyl acetate (2×50 mL). The organic layers were washed with a saturated aqueous sodium chloride solution (50 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70–230 mesh, 70% ethyl acetate/hexanes) afforded 2-(3-chloro-4-methanesulfonyl-phenyl)-3-(3-methoxyimino-cyclopentyl)-N-pyrazin-2-yl-propionamide (61.2 mg, 78%) as a white foam: mp 85–87° C.; (ES)+-HRMS m/e calcd for C20H23ClN4O4S (M+H)+ 451.1202 found 451.1207.

1. temperatureunder reflux for 5 h
2. concentrationwas then concentrated in vacuo
3. additionThe resulting residue was diluted with water (50 mL)
4. extractionextracted with ethyl acetate (2×50 mL)
5. washThe organic layers were washed with a saturated aqueous sodium chloride solution (50 mL)
6. dry with materialdried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo