Synthesis of a Series of Aromatic Benziporphyrins and Heteroanalogues via Tripyrrane-Like Intermediates Derived from Resorcinol and 2-Methylresorcinol
作者:Timothy D. Lash、Kae Miyake、Linlin Xu、Gregory M. Ferrence
DOI:10.1021/jo201098c
日期:2011.8.5
Tripyrrane analogues were prepared by reacting resorcinol or 2-methylresorcinol with 2 equiv of an acetoxymethylpyrrole in the presence of p-toluenesulfonic acid and calcium chloride. Following removal of the benzyl ester protective groups, the resorcinol-derived benzitripyrrane was reacted with a pyrrole dialdehyde to give an aromatic hydroxyoxybenziporphyrin. However, furan and thiophene dialdehydes
Tripyrrane类似物通过间苯二酚或2-甲基与2当量的acetoxymethylpyrrole的存在下反应来制备p-甲苯磺酸和氯化钙。除去苄基酯保护基后,使间苯二酚衍生的苯并三吡喃与吡咯二醛反应,得到芳族羟氧基苯并卟啉。但是,呋喃和噻吩二醛产生了高度不溶的产物,无法完全表征。衍生自甲基间苯二酚的三吡喃类似物与吡咯,呋喃,噻吩和硒基二醛反应,得到不稳定的卟啉类,再用[双(三氟乙酰氧基)碘]苯氧化,得到稳定的苯并卟啉衍生物。这些氧化的苯并卟啉通过质子NMR光谱显示出强烈的变渗性质,在某些情况下,化学位移的差异(Δδ)大于18 ppm。X射线晶体学进一步表征了亚硒酚衍生的体系,这些结果表明,该拥挤结构中的吡咯亚基之一相对于平均大环平面倾斜了21°。该三吡咯体系与乙酸银(I)反应,得到相应的银(III)有机金属配合物。用甲基碘或乙基碘与碳酸钾进行区域选择性烷基化,得到下列化合物的非对映异构体混