Synthesis of the 2,2′:3′,3′':2′',2′'' tetraindole framework of the alkaloid bisindigotin
作者:Maurycy Prystupa、Tilo Söhnel、Jonathan Sperry
DOI:10.1016/j.tetlet.2022.154082
日期:2022.9
we report a synthesis of the 2,2′:3′,3′':2′',2′''-tetraindole core of the putative bisindigotin structure through a strategic ordering of oxidative dimerization, reduction and dehydration events. The instability of 2,2′:3′,3′':2′',2′''-tetraindole towards a variety of oxidants precluded the synthesis of bisindigotin by late-state oxidation. A p-TSA mediated rearrangement of a 2,2′:3′,3′':2′',2′'' tetraindole
以前使用基于 3-羟基吲哚的前体对生物碱 bisindigotin 所做的努力主要是重排化学,它破坏了天然产物的所需四吲哚骨架。在这里,我们报告了通过氧化二聚化、还原和脱水事件的战略排序,合成了假定的 bisindigotin 结构的 2,2':3',3'':2'',2'''-四吲哚核心。2,2':3',3'':2'',2'''-四吲哚对多种氧化剂的不稳定性阻碍了通过后期氧化合成双靛红。p -TSA 介导的 2,2':3',3'':2'',2''' 四吲哚重排为 3,2':3',3'':2'',3' ' ' 区域异构体也有报道。