Dicarbaporphyrinoid Systems. Synthesis of Oxo-<i>adj</i>-dibenziphlorins
作者:Deyaa I. AbuSalim、Michelle L. Merfeld、Timothy D. Lash
DOI:10.1021/jo401756q
日期:2013.10.18
A series of diformylbenzophenones were generated by sequentially reacting protected bromobenzaldehydes with n-butyllithium and ethyl N,N-dimethylcarbamate. The acetal protective groups were cleaved with refluxing formic acid. Vilsmeier–Haack formylation of 2,2′,4,4′-tetramethoxybenzophenone also afforded a related dialdehyde. MacDonald “2 + 2” condensation of three benzophenone dialdehydes with a dipyrrylmethane
通过使受保护的溴苯甲醛与正丁基锂和N,N-二甲基氨基甲酸乙酯顺序反应,生成了一系列二甲酰基二苯甲酮。缩醛保护基被回流的甲酸裂解。2,2',4,4'-四甲氧基二苯甲酮的Vilsmeier-Haack甲酰化反应也提供了相关的二醛。三种二苯甲酮二醛与二吡咯基甲烷的麦克唐纳“ 2 + 2”缩合反应产生了由两个苯和两个吡咯环构成的氧卟啉类似物。游离碱恶二苯并hl庚因在溶液中相当不稳定,并且在大多数情况下,这些卟啉类化合物作为相应的三氟乙酸盐被分离出来。6-氧代邻苯二甲酸酯的光谱性质-dibenziphlorins与非芳族环系统一致。DFT计算表明,大环与平面度大不相同,特别是当芳烃环上存在甲氧基取代基时。