Synthesis of Isomeric Angularly Annealed Dinaphthoporphyrin Systems: Examination of the Relative Positioning and Orientation of Ring Fusion as Factors Influencing the Porphyrin Chromophore
作者:Jerad M. Manley、Tracy J. Roper、Timothy D. Lash
DOI:10.1021/jo040269r
日期:2005.2.1
Porphyrins built up from two naphtho[1,2-c]pyrrole subunits and two β-substituted pyrroles can produce five isomeric dinaphthoporphyrin systems. To gain insights into the effects of ring fusion on extended porphyrin chromophores, all five of these systems were synthesized in isomerically pure form. In four of these syntheses, dihydronaphthopyrroles were used to introduce one or both of the naphthalene
由两个萘并[1,2- c ]吡咯亚基和两个β-取代的吡咯构成的卟啉可产生五个异构的萘并卟啉体系。为了深入了解环融合对扩展卟啉发色团的影响,所有这五个系统均以异构体纯净形式合成。在这些合成中的四个中,使用二氢萘吡咯引入一个或两个萘亚基,然后在回流的甲苯中用DDQ脱氢,随后生成完全共轭的系统。萘吡咯还通过在磷腈碱存在下使异氰基乙酸酯与1-硝基萘反应来制备。这些化合物被证明不如其二氢萘吡咯类似物稳定,但仍可用于这些合成研究中。三异构ADJ使用麦当劳“ 2 + 2”缩合反应或通过氯化铜(II)或AgIO 3 -Zn(OAc)2的α,c-胆二烯中间体环化制备-二萘甲卟啉体系。与朝向彼此指向2个萘单元A dinaphthoporphyrin只能低收率由于稳定性和位阻因素的组合来获得,但其他两个ADJ -difused系统,可在良好的整体产率分离。但是,最终的脱氢步骤以中等收率(50-60%)发生,并且