1-ethyl-8-[2-(3-fluoro-4-trifluoromethyl-phenyl)-ethyl]-5,6-dihydro-8H-imidazo[1,5-a]pyrazine-7-carboxylic acid tert-butyl ester 、
N-溴代丁二酰亚胺(NBS) 以
ethyl acetate heptane 为溶剂,
反应 1.0h,
以afforded 3-bromo-1-ethyl-8-[2-(3-fluoro-4-trifluoromethyl-phenyl)-ethyl]-5,6-dihydro-8H-imidazo[1,5-a]pyrazine-7-carboxylic acid tert-butyl ester as a pale yellow solid (0.931 g; 79%)的产率得到3-bromo-1-ethyl-8-[2-(3-fluoro-4-trifluoromethyl-phenyl)-ethyl]-5,6-dihydro-8H-imidazo[1,5-a]pyrazine-7-carboxylic acid tert-butyl ester