1-(methoxy-methyl-carbamoyl)-3-trifluoromethyl-5,6-dihydro-8H-imidazo[1,5-a]pyrazine-7-carboxylic acid tert-butyl ester 、
环戊基溴化镁 、
氯化铵 在
crude mixture 、
乙酸乙酯 、
magnesium sulfate 、 silica gel 、
1-Cyclopentanecarbonyl-3-trifluoromethyl-5,6-dihydro-8H-imidazo[1,5-a]pyrazine-7-carboxylic acid tert-butyl ester 作用下,
以
四氢呋喃 、 Brine 为溶剂,
反应 3.0h,
以to obtain the title compound 1-cyclopentanecarbonyl-3-trifluoromethyl-5,6-dihydro-8H-imidazo[1,5-a]pyrazine-7-carboxylic acid tert-butyl ester 28a (0.1 g, yield 30%) as a yellow oil的产率得到1-Cyclopentanecarbonyl-3-trifluoromethyl-5,6-dihydro-8H-imidazo[1,5-a]pyrazine-7-carboxylic acid tert-butyl ester