Aromatization-driven Grob-fragmentation approach toward polyazaacenes. Synthesis and amination of multi-functionalized diazapentacenes
作者:Teh-Chang Chou、Ju-Fang Cheng、Atul R. Gholap、Jim Jing-Kai Huang、Jyun-Chang Chen、Jing-Kai Huang、Jui-Chang Tseng
DOI:10.1016/j.tet.2019.130689
日期:2019.11
A general approach toward the synthesis of multi-functionalized diazapentacene derivatives 1, using 1,2,3,4-tetrachloro-5,5-dimethoxycyclopentadiene (TDCp, 2), a substituted benzene-1,2-diamine (ADA, 6), and a naphthalene-1,4-dione (BQ, 3) as the building units, is described. The synthesis basically entails three operations: (i) oxidation of the dichloroetheno-bridge in the Diels-Alder cycloadduct
使用1,2,3,4-四氯-5,5-二甲氧基环戊二烯(TDCp,2),取代的苯-1,2-二胺(ADA,6)合成多功能二氮杂戊并苯衍生物1的一般方法描述了萘-1,4-二酮(BQ,3)作为构建单元。合成基本上需要进行三个操作:(i)TDCp的Diels-Alder环加合物4和3中的二氯乙二烯桥氧化,(ii)用ADA生成的1,2-二酮5缩合,生成喹喔啉稠合的多环化合物7,然后(iii)以碱或酸催化的芳构化驱动的Grob型片段为键的一锅三反应过程,生成喹喔啉环嵌入的二氮杂戊烯酸酯1。所述diazapentacene衍生物1A进行亲核芳族本位-amination与伯胺和仲胺,得到氨基取代的衍生物12在由共面π堆叠相互作用驱动的固体状态下,通过的晶体堆积结构表现出来,其倾向于自组装12a和12f。