The synthesis of pyridothiazepines has been achieved via a 1,5‐dipolar cycloaddition reaction between pyridinium 1,4‐zwitterionic thiolates and activated allenes conducted under thermal conditions. Meanwhile, a ring‐contraction reaction of the resulting pyridothiazepine derivatives via the extrusion of 3‐thioxoacrylates has also been described.

中文翻译：

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通过1,4-两性离子硫代吡啶盐与活化的烯类化合物之间的1,5-偶极环加成反应合成吡啶并氮杂卓

吡啶硫并氮杂卓类化合物的合成是通过在热条件下进行的吡啶鎓1,4-两性离子硫醇盐和活化的丙二烯之间的1,5-偶极环加成反应实现的。同时，还描述了通过3-硫代丙烯酸酯的挤出反应生成的吡啶硫并ze庚因衍生物的环收缩反应。