(R)-7-[3-tertbutoxycarbonylamino-4-(2,4,5-tri-fluorophenyl)butyryl]-3-trifluoromethyl-5,6,7,8-tetrahydro-imidazo[1,5-a]pyrazine-1-carboxylic acid 、
氨基乙腈硫酸氢盐 、 、
三乙胺 在
silica gel 、
(R)-[3-[1-(cyanomethylcarbamoyl)-3-trifluoromethyl-5,6-dihydro-8H-imidazo[1,5-a]pyrazin-7-yl]-3-oxo-1-(2,4,5-trifluorobenzyl)propyl]carbamic acid tert-butyl ester 作用下,
以
二氯甲烷 为溶剂,
反应 16.0h,
以to obtain the title compound (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 (150 mg, yield 94.4%) as a white solid的产率得到(R)-[3-[1-(cyanomethylcarbamoyl)-3-trifluoromethyl-5,6-dihydro-8H-imidazo[1,5-a]pyrazin-7-yl]-3-oxo-1-(2,4,5-trifluorobenzyl)propyl]carbamic acid tert-butyl ester