Revision of the Structure and Total Synthesis of Topsentin C

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An efficient synthetic approach to access (indol-3-yl)ethane-1,2-diamines with a protecting group at the indole N atom from readily available 3-(2-nitrovinyl)indoles is reported. This approach includes solvent-free conjugate addition of O-pivaloylhydroxylamines to 1-Boc-3-(2-nitrovinyl)indoles followed by mild reduction of the adducts. The obtained (indol-3-yl)ethane-1,2-diamines are convenient synthetic precursors for several classes of marine alkaloids. The first total synthesis of racemic topsentin C, a secondary metabolite from Hexadella sp., based on this approach is reported. The initially proposed structure for topsentin C has been revised.




Golantsov, N. E., Festa, A. A., Varlamov, A. V., & Voskressensky, L. G. (2017). Revision of the Structure and Total Synthesis of Topsentin C. Synthesis (Germany), 49(11), 2562.

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