8-{2-[(3R,4S)-4-amino-3-hydroxy-1-piperidinyl]ethyl}-7-chloro-1-methyl-1,5-naphthyridin-2(1H)-one 、
3-氧代-3,4-二氢-2H-吡啶并[3,2-b][1,4]噁嗪-6-甲醛 在
crude product 、 silica gel 作用下,
反应 5.0h,
生成 6-[({(3R,4S)-1-[2-(3-Chloro-5-methyl-6-oxo-5,6-dihydro-1,5-naphthyridin-4-yl)ethyl]-3-hydroxy-4-piperidinyl}amino)methyl]-2H-pyrido[3,2-b][1,4]oxazin-3(4H)-one dihydrochloride