(3-bromo-4-methoxy-phenyl)-(2,3-dihydro-pyrido[4,3-b][1,4]oxazin-4-yl)-methanone 、 、
三溴化硼 在
(3-bromo-4-hydroxy-phenyl)-(2,3-dihydro-pyrido[4,3-b][1,4]oxazin-4-yl)-methanone 作用下,
以to obtain the target compound 38, i.e., (3-bromo-4-hydroxy-phenyl)-(2,3-dihydro-pyrido[4,3-b][1,4]oxazin-4-yl)-methanone (256 mg, 89%)的产率得到(3-bromo-4-hydroxy-phenyl)-(2,3-dihydro-pyrido[4,3-b][1,4]oxazin-4-yl)-methanone