反应详情

温度

60 °C

A solution of 2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-[5-(1,1-dimethoxy-ethyl)-pyrazin-2-yl]-propionamide (1.22 g, 2.459 mmol) in acetone (28 mL) and water (3 mL) was treated with p-toluenesulfonic acid monohydrate (142.5 mg, 0.738 mmol). The reaction mixture was heated to 60° C. for 30 min and then was diluted with ethyl acetate (100 mL). The organic layer was washed with a saturated aqueous sodium bicarbonate solution (100 mL), water (100 mL), and a saturated aqueous sodium chloride solution (100 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40M, Silica, 1/3 ethyl acetate/hexanes) afforded the N-(5-acetyl-pyrazin-2-yl)-2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionamide as a white foam (1.07 g, 96%): mp 77–80° C. (foam to gel); (ES)+-HRMS m/e calcd for C21H24ClN3O4S (M+H)+ 450.1249, found 450.1253.

1. washThe organic layer was washed with a saturated aqueous sodium bicarbonate solution (100 mL), water (100 mL)
2. dry with materiala saturated aqueous sodium chloride solution (100 mL), dried over magnesium sulfate
3. filtrationfiltered
4. concentrationconcentrated in vacuo