2,3-二氢-1H-吡啶并[3,4-b][1,4]噁嗪   、                                                                                      
3,5-dibromo-4-methoxybenzoyl chloride                                                                                                                                                              在
                                                                                                                                                                                 
(3,5-dibromo-4-methoxy-phenyl)-(2,3-dihydro-pyrido[3,4-b][1,4]oxazin-1-yl)-methanone                                                                                                                                  作用下,
                                                                                                                                                                                                                            以to obtain the target compound 5, (3,5-dibromo-4-methoxy-phenyl)-(2,3-dihydro-pyrido[3,4-b][1,4]oxazin-1-yl)-methanone的产率得到(3,5-dibromo-4-methoxy-phenyl)-(2,3-dihydro-pyrido[3,4-b][1,4]oxazin-1-yl)-methanone