反应详情

(+/−)-tert-butyl (3-((3R,4R)-3-((tert-butyldimethylsilyl)oxy)-4-morpholinopiperidin-1-yl)-2-chloro-5-cyanophenyl)carbamate (138 mg, 0.250 mmol) was treated with TFA (25% in 1,2-dichloroethane, 3 mL, 9.73 mmol) at room temperature for 1 h. The reaction mixture was diluted with dichloromethane and washed with cold saturated sodium bicarbonate/1N aqueous sodium hydroxide (pH 10). The layers were separated and aqueous layer was extracted with dichloromethane two more times. The combined organic layers were dried over magnesium sulfate, filtered and concentrated in vacuo, the crude product was purified by flash chromatography on silica gel using an automated ISCO system (24 g column, eluting with 5-40% ethyl acetate/hexanes). (+/−)-3-amino-5-((3R,4R)-3-((tert-butyldimethylsilyl)oxy)-4-morpholinopiperidin-1-yl)-4-chlorobenzonitrile (106 mg) was obtained as a yellow/brown solid.

1. washwashed with cold saturated sodium bicarbonate/1N aqueous sodium hydroxide (pH 10)
2. customThe layers were separated
3. extractionaqueous layer was extracted with dichloromethane two more times
4. dry with materialThe combined organic layers were dried over magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customthe crude product was purified by flash chromatography on silica gel using
8. washan automated ISCO system (24 g column, eluting with 5-40% ethyl acetate/hexanes)