3-氯-4-吡啶硼酸水合物 、 6-bromo-8-[(1-tert-butoxycarbonylpiperidin-4-ylmethyl)amino]imidazo[1,2-a]pyrazine-2-carboxylic acid ethyl ester 生成 8-[(1-tert-butoxycarbonylpiperidin-4-ylmethyl)amino]-6-(3-chloropyridin-4-yl)imidazo[1,2-a]pyrazine-2-carboxylic acid ethyl ester