5 years ago

Unified biomimetic assembly of voacalgine A and bipleiophylline via divergent oxidative couplings

Unified biomimetic assembly of voacalgine A and bipleiophylline via divergent oxidative couplings
Laurent Evanno, Régis Guillot, Guillaume Vincent, Karine Leblanc, Kadiria Ahamada, Cyrille Kouklovsky, Victor Turpin, Jean-François Gallard, Vincent Dumontet, David Lachkar, Natacha Denizot, Mehdi A. Beniddir, Elvis Otogo N'nang, Guillaume Bernadat, Erwan Poupon
Bipleiophylline is a highly complex monoterpene indole alkaloid composed of two pleiocarpamine units anchored on an aromatic spacer platform. The synthesis of bipleiophylline is considered as a mountain to climb by the organic chemistry community. Here, a unified oxidative coupling protocol between indole derivatives and 2,3-dihydroxybenzoic acid, mediated by silver oxide, has been developed to produce the core of bipleiophylline. This method also allows the independent preparation of benzofuro[2,3-b]indolenine and isochromano[3,4-b]indolenine scaffolds, depending only on the nature of the aromatic platform used. The procedure has been applied to simple indole derivatives and to more challenging monoterpene indole alkaloids, thereby furnishing natural-product-like structures. The use of scarce pleiocarpamine as the starting indole allows the first syntheses of bipleiophylline and of its biosynthetic precursor, voacalgine A. The structure of the latter has been reassigned in the course of our investigations by 2D NMR and displays an isochromano[3,4-b]indolenine motif instead of a benzofuro[2,3-b]indolenine.

Publisher URL: http://dx.doi.org/10.1038/nchem.2735

DOI: 10.1038/nchem.2735

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