Trifluoroacetic acid → HCID 86708515, compound

Participants

Reaction Steps

(+/−)-tert-butyl ((3R,4R)-1-(3-amino-2-chloro-5-cyanophenyl)-3-((tert-butyldimethylsilyl)oxy)piperidin-4-yl)(methyl)carbamate (Example 186B, 78 mg, 0.158 mmol) was treated with TFA (25% in 1,2-dichloroethane, 0.012 mL, 0.158 mmol) at rt for 1 h. LCMS showed completion of reaction. The reaction mixture was diluted with dichloromethane and washed with cold saturated sodium bicarbonate/1N aqueous sodium hydroxide (pH 10). The organic layer was 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 (12 g column, eluting with 1-10% 2 N ammonia in methanol/dichloromethane) to give (+/−)-3-amino-5-((3R,4R)-3-((tert-butyldimethylsilyl)oxy)-4-(methylamino)piperidin-1-yl)-4-chlorobenzonitrile (54 mg) was obtained as a colorless oil.

Provenance & Evidence