(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 、
2-哌嗪酮 、 、
三乙胺 在
silica gel 、
(R)-[3-oxo-3-[1-(3-oxo-piperazine-1-carbonyl)-3-trifluoromethyl-5,6-dihydro-8H-imidazo[1,5-a]pyrazin-7-yl]-1-(2,4,5-trifluoro-benzyl)-propyl]-carbamic acid tert-butyl ester 作用下,
以
N,N-二甲基甲酰胺 、
二氯甲烷 为溶剂,
反应 16.0h,
以to obtain the title compound (R)-[3-oxo-3-[1-(3-oxo-piperazine-1-carbonyl)-3-trifluoromethyl-5,6-dihydro-8H-imidazo[1,5-a]pyrazin-7-yl]-1-(2,4,5-trifluoro-benzyl)-propyl]-carbamic acid tert-butyl ester 19a (140 mg, yield 82%) as a colourness oil的产率得到(R)-[3-oxo-3-[1-(3-oxo-piperazine-1-carbonyl)-3-trifluoromethyl-5,6-dihydro-8H-imidazo[1,5-a]pyrazin-7-yl]-1-(2,4,5-trifluoro-benzyl)-propyl]-carbamic acid tert-butyl ester