、
4-(2-(3-cyanophenylcarbamoyloxy)ethyl)-3-ethylphenylboronic acid 、
6-amino-1-(di-tert-butoxycarbonylamino)isoquinoline 、
乙醛酸水合物 以to afford 57A (186 mg, 52%) as an oil的产率得到2-(1-(bis(tert-butoxycarbonyl)amino)isoquinolin-6-ylamino)-2-(4-(2-(3-cyanophenylcarbamoyloxy)ethyl)-3-ethylphenyl)acetic acid