Synthesis and detailed conformational analysis of new naphthoxazino[2,3-a]benz[c]azepine and naphthoxazino[2,3-a]thieno[3,2-c]pyridine derivatives
作者:István Szatmári、Petra Barta、Antal Csámpai、Ferenc Fülöp
DOI:10.1016/j.tet.2017.06.060
日期:2017.8
naphthoxazine by-products made the separation/purification of the products challenging, therefore the reactions were repeated and systematically studied, starting from secondary and tertiary aminonaphthol derivatives, when the isolation of an ortho-quinonemethide structure occurred unexpectedly. Scope and limitations of its formation were also investigated. Conformational studies including ring inversion of a
通过修饰的曼尼希型合成途径,通过4,5-二氢-3 H-苯并[ c ]氮杂或6,7-二氢噻吩并[3, 2- c ]吡啶和不同的取代氨基萘。使用微波辐射优化了反应条件,反应时间相对较短,温度为80°C。不需要的萘并恶嗪副产物的形成使产物的分离/纯化具有挑战性,因此,当分离邻位时,从仲氨基和叔氨基萘酚衍生物开始重复和系统地研究反应,从仲和叔氨基萘酚开始-醌甲基化物结构出乎意料地发生。还研究了其形成的范围和局限性。使用NMR方法和补充DFT建模进行了构象研究,包括对新型多杂环化合物的选择进行环倒置。