application of sulfenamides for ring expansion on nitrogen atom has been reported to give 1,4,2,5-dithiadiazines (3) from 1,4,2-dithiazolium salts (1). The structure of 3 was confirmed by X-ray crystallographic analysis. The similar ring expansion reaction occurred on 1,3-dithiolium salts (5) to afford 1,4,2-dithiazines (6).
据报道,使用次磺酰胺在氮原子上扩环的第一个例子是从 1,4,2-二
噻唑鎓盐 (1) 得到 1,4,2,5-二噻二嗪 (3)。通过X射线晶体学分析证实了3的结构。类似的扩环反应发生在 1,3-二
硫鎓盐 (5) 上,得到 1,4,2-二
噻嗪 (6)。