1-[2-(4-aminopiperidin-1-yl)ethyl]-6,7-dimethoxyquinoxalin-2(1H)-one 、
3-氧代-3,4-二氢-2H-吡啶并[3,2-b][1,4]噁嗪-6-甲醛 、
三乙酰氧基硼氢化钠 、 以to give 78 mg (68%) of the free base of the product as a colorless solid的产率得到6-[((1-[2-(6,7-dimethoxy-2-oxoquinoxalin-1(2H)-yl)ethyl]piperidin-4-yl)amino)methyl]-2H-pyrido[3,2-b][1,4]oxazin-3(4H)-one