反应详情

(R)-[3-(1-Cyclopentanecarbonyl-3-trifluoromethyl-5,6-dihydro-8H-imidazo[1,5-a]pyrazin-7-yl)-3-oxo-1-(2,4,5-trifluoro-benzyl)-propyl]-carbamic acid tert-butyl ester 28c (0.11 g, 0.183 mmol) was dissolved in 2 mL of ethyl acetate under stirring. A solution of 2.4 N hydrochloric acid in 5 mL of ethyl acetate was added to the above solution. The reaction mixture was stirred at room temperature and monitored by thin layer chromatography until the disappearance of the starting materials. The reaction mixture was concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography to obtain the title compound (R)-3-amino-1-(1-cyclopentanecarbonyl-3-trifluoromethyl-5,6-dihydro-8H-imidazo[1,5-a]pyrazin-7-yl)-4-(2,4,5-trifluoro-phenyl)-butan-1-one hydrochloride 28 (80 mg, yield 81%) as a yellow solid.

1. stirringThe reaction mixture was stirred at room temperature
2. concentrationThe reaction mixture was concentrated under reduced pressure
3. customThe resulting residue was purified by silica gel column chromatography