Pyrimido-(1, 4)-benzothiazinedione (I) underwent oxidative coupling with water, alcohols and morpholine at the 4α-angular position in the presence of iodine and base such as triethylamine or morpholine. The facile Pummerer rearrangement of its sulfoxide also give 4α-substituted derivatives. The mechanisms of these reaction are also discussed.
                                    嘧啶-(1, 4)-苯并噻二酮 (I) 在
碘和碱如
三乙胺或吗啉的存在下,在 4α 角位置与
水、醇和吗啉发生氧化偶联反应。其亚砜的简易 Pummerer 重排也能得到 4α 取代的衍
生物。本文还讨论了这些反应的机理。