thionyl chloride followed by an aniline to give the amides (4)(70%). Refluxing in toluene with sodium hydride for 12 h transfers intramolecularly the 1-aryl group of the pyridinium salt (4) to the nitrogen of the amide. Aqueous work-up cleaves (6) and the diarylamine is purified by sublimation (60%)(overall yield ca. 30%).
2-乙氧基羰基-4,6-二苯基
吡啶鎓盐(1)与各种环取代的
苯胺反应,得到相应的
吡啶鎓盐(2)(平均收率90%);将它们
水解成
吡啶鎓
甜菜碱(3)(75%),先用亚
硫酰氯,再用
苯胺处理,得到酰胺(4)(70%)。用氢化
钠在
甲苯中回流12小时,将
吡啶鎓盐(4)的1-芳基分子内转移到酰胺的氮上。
水后处理裂解(6),二芳基胺通过升华(60%)纯化(总产率约30%)。