Support studies toward the alkaloids mescengricin and lysiformine focused on oxazole-olefin cycloadditions
作者:Karen Ichikawa、Simon X. Lin、Tilo Söhnel、Jonathan Sperry
DOI:10.1016/j.tet.2024.133992
日期:2024.5
An oxazolo[4,5-]indole serves as an azadiene in a regioselective Kondrat'eva reaction forming the core of the neuroprotective alkaloid mescengricin, the first such application of this venerable [4 + 2]-cycloaddition for the synthesis of α-carbolines. In a reaction that has possible biosynthesis implications, the 6-(indolylmethyl)pyridin-3-ol unit of the marine-derived alkaloid lysiformine has also
恶唑并[4,5-]吲哚在区域选择性 Kondrat'eva 反应中充当氮杂二烯,形成神经保护性生物碱 mescengricin 的核心,这是这种古老的 [4 + 2]-环加成在 α-咔啉合成中的首次应用。在可能具有生物合成意义的反应中,海洋生物碱赖西福明的 6-(吲哚甲基)吡啶-3-醇单元也已通过使用 2-(吲哚甲基)-5-乙氧基恶唑的区域选择性 Kondrat'eva 反应制备如氮杂二烯。