Dichloromethane → (R)-7-[3-amino-4-(2,4,5-trifluoro-phenyl)-butyryl]-3-trifluoromethyl-5,6,7,8-tetrahydro-imidazo[1,5-a]pyrazine-1-carboxylic acid cyanomethyl-amide hydrochloride

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반응 단계

(R)-[3-[1-(Cyanomethyl-carbamoyl)-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 4a (0.3 g, 0.25 mmol) was dissolved in 10 mL of dichloromethane, and 5 mL of trifluoroacetic acid was then added to the solution. The reaction mixture was reacted at room temperature for 1 hour until thin lay chromatography showed the starting material disappeared. The reaction mixture was concentrated under reduced pressure to obtain the title compound (R)-7-[3-amino-4-(2,4,5-trifluoro-phenyl)-butyryl]-3-trifluoromethyl-5,6,7,8-tetrahydro-imidazo[1,5-a]pyrazine-1-carboxylic acid cyanomethyl-amide hydrochloride 4 (130 mg) as a light yellow solid.

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