(R)-benzyl 3-(8-amino-1-bromoimidazo[1,5-a]pyrazin-3-yl)piperidine-1-carboxylate 、
7-((Benzyloxy)carbonyl)-7-azabicyclo[2.2.1]heptane-2-carboxylic acid 以to obtain benzyl 2-(8-amino-1-bromoimidazo[1,5-a]pyrazin-3-yl)-7-azabicyclo[2.2.1]heptane-7-carboxylate的产率得到benzyl 2-(8-amino-1-bromoimidazo[1,5-a]pyrazin-3-yl)-7-azabicyclo[2.2.1]heptane-7-carboxylate