Dendritic metalloporphyrins with a distal H-bond donor as mimics of haemoglobinElectronic supplementary information (ESI) available: procedures for the synthesis of 1 and 5 and iron(ii) insertion into the dendritic porphyrins including full spectral characterisation and complete EPR characterisation of the complex 22·Co(dmim) and the corresponding oxygenated complex. See http://www.rsc.org/suppdata/ob/b2/b212468h/
We report the synthesis of iron(II) porphyrins functionalised with first- and second-generation dendrons as mimics of haemoglobin. The porphyrin core bears an ethynyl linker pointing towards the centre of the molecule, in an ideal position for the introduction of a series of distal ligands as potential H-bond donors by Pd0-catalysed Sonogashira cross-coupling.
Synthesis of Dendritic Metalloporphyrins withDistal H-Bond Donors as Model Systems for Hemoglobin
作者:Beatrice Felber、Fran�ois Diederich
DOI:10.1002/hlca.200490288
日期:2005.1
the synthesis of the first- (G1) and second-generation (G2) dendritic FeII porphyrins 1⋅Fe–4⋅Fe (G1) and 6⋅Fe (G2) bearing distal H-bond donors ideally positioned for stabilization of FeIIO2 adducts by H-bonding (Fig. 1). A first approach towards the construction of these novel biomimetic systems failed unexpectedly: the Suzuki cross-coupling between appropriately functionalized ZnII porphyrins and
我们报告了第一(G1)和第二代(G2)树状Fe II卟啉1⋅Fe – 4⋅Fe(G1)和6⋅Fe(G2)的合成,它们具有远端H键供体的理想位置,可以稳定化Fe II O 2通过氢键加成(图1)。构建这些新型仿生系统的第一种方法出乎意料地失败了:适当功能化的Zn II卟啉与邻乙炔基芳基衍生物之间的Suzuki交叉偶联未能成功(作为远端H键供体基团的锚点)(方案1、3和5),大概是由于在催化循环中乙炔基残基与Pd物质的不利配位所引起的位阻(方案6)。靶分子终于通过其中的路线制备邻-ethynylated内消旋被卟啉结构中涉及两个dipyrrylmethanes的混合缩合引入芳基环33和34,和醛36(方案7和8)。树突附着后(方案11),由Sonogashira引入了远端H键供体交叉偶联(方案12),然后进行金属化,得到树枝状的Fe II卟啉1⋅Fe – 6⋅Fe。1 H-NMR光谱证实了在卟