A series of spirooxazine derivatives containing nitrogen heterocycles were synthesized through the condensation of 2-methylene-1,3,3-trimethylindoline derivatives with the zinc salt of 1-nitroso-2-naphthol using ethanol as solvent. The method is simple, starts from readily accessible and inexpensive reagents, and leads to the synthesis of 6′-substituted spirooxazines in moderate to good yields. We simplified the workup and found that, for some target compounds, recrystallization can effectively improve efficiency of the separation and purification.
以
乙醇为溶剂,通过 2-亚甲基-1,3,3-三甲基
吲哚啉衍
生物与
1-亚硝基-2-萘酚锌盐的缩合,合成了一系列含氮杂环的螺噁嗪衍
生物。该方法简单易行,从容易获得且价格低廉的试剂开始,以中等至良好的收率合成 6′-取代的螺噁嗪。我们简化了操作步骤,并发现对于某些目标化合物,重结晶可以有效提高分离和纯化的效率。