derivatives are also obtained by the reaction of α-bromooximes with vinyl ethers and silyl enol ethers in the presence of Na2CO3. Dihydro-1,2-oxazines can be converted into pyrrole derivatives via reductive deoxygenation by treating with Fe3(CO)12 in moderate to excellent yields. Iron carbonyl complexes other than Fe3(CO)12 are also effective for the pyrrole-forming reaction. The efficiency of the complexes
α-
溴肟,如 α-
溴苯乙酮肟和 3-溴-2-(羟基亚
氨基)
丙酸乙酯与烯胺反应,以良好的收率得到 5,6-二氢-4H-1,2-恶嗪。二氢-1,2-恶嗪衍
生物也可通过α-
溴肟与
乙烯基醚和甲
硅烷基烯醇醚在Na2CO3 存在下反应获得。二氢-1,2-恶嗪可以通过还原脱氧反应转化为
吡咯衍
生物,方法是用 Fe3(CO)12 处理,产率中等至极好。Fe3(CO)12 以外的
羰基铁配合物对
吡咯形成反应也有效。该反应中配合物的效率依次降低:Fe3(CO)12>>Et3NH[HFe3(CO)11]>Fe2(CO)9>>Fe(CO)5。二氢-1,2-恶嗪-和
吡咯-形成反应都可以在一个烧瓶中进行,得到高产率的
吡咯衍
生物。