(3,5-dibromo-4-methoxy-phenyl)-[7-(3-nitro-phenyl)-2,3-dihydro-pyrido[2,3-b][1,4]oxazin-1-yl]-methanone 、
溴化锂 、
哌嗪 在
f 、
(3,5-dibromo-4-hydroxy-phenyl)-[7-(3-nitro-phenyl)-2,3-dihydro-pyrido[2,3-b][1,4]oxazin-1-yl]-methanone 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以to obtain the target compound 50, i.e., (3,5-dibromo-4-hydroxy-phenyl)-[7-(3-nitro-phenyl)-2,3-dihydro-pyrido[2,3-b][1,4]oxazin-1-yl]-methanone的产率得到(3,5-dibromo-4-hydroxy-phenyl)-[7-(3-nitro-phenyl)-2,3-dihydro-pyrido[2,3-b][1,4]oxazin-1-yl]-methanone