First synthetic entry to the trimer stage of 5,6-dihydroxyindole polymerization: ortho-alkynylaniline-based access to the missing 2,7′:2′,7′′-triindole
作者:Luigia Capelli、Paola Manini、Alessandro Pezzella、Marco d'Ischia
DOI:10.1039/c0ob00037j
日期:——
5,6-Dihydroxyindole oligomers are valuable synthetic targets for the structural characterization of eumelanin biopolymers as well as for the realization of bioinspired functional materials. An ortho-alkynylaniline-based strategy allowed the first access to a trimer, the missing 5,5â²,5â²â²,6,6â²,6â²â²-hexaacetoxy-2,7â²:2â²,7â²â²-triindole, and its detection as a minor intermediate en route from 5,6-dihydroxyindole to eumelanin-like polymers.
5,6-二羟基吲哚低聚物是合成真黑素生物聚合物结构特征以及实现仿生功能材料的宝贵目标。基于邻炔基苯胺的策略首次实现了三聚体——缺失的5,5²,5²,6,6²,6²,7²,2,7²:2,7²-三吲哚——的合成,并将其作为从5,6-二羟基吲哚到类黑素聚合物的中间产物。