Unsymmetrical<i>vic</i>-Tricarbonyl Compounds for the Total Syntheses of Cladoniamide G and Cladoniamide F
作者:Julia Schütte、Frank Kilgenstein、Michel Fischer、Ulrich Koert
DOI:10.1002/ejoc.201402531
日期:2014.8
A 2-unsubstituted indole adds under Cu-box-catalysis to mesoxalic ester amides with high enantioselectivity, whereas low enantiomeric excess is obtained for 2-substituted indoles. A mesoxalic ester amide is used as key component in the total syntheses of alkaloids cladoniamide G and cladoniamide F. The natural product syntheses involve Suzuki cross-coupling to a 2,2′-biindole, arylation of the vic-tricarbonyl
2-未取代的吲哚在 Cu-box 催化下以高对映选择性加成到间草酸酯酰胺中,而 2-取代的吲哚获得低对映体过量。中草酸酯酰胺用作生物碱克拉多胺 G 和克拉多胺 F 全合成的关键组分。 天然产物合成涉及 Suzuki 与 2,2'-联吲哚的交叉偶联、vic-三羰基化合物的芳基化和分子内内酰胺形成。