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Couplages oxydants entre indoles et phénols pour la synthèse de benzofuroindolines naturelles

Abstract : The benzofuro[2,3-b]indoline core is a complex structure present in several natural products such as azonazine, voacalgine A, bipleiophylline and diazonamide A. These products possess an interesting biological activity and especially diazonamide A with an IC50 below 15ng/mL on different cancer cells lines. Some of these compounds have never been synthesize. It is postulated that the biogenesis of the benzofuroindolines natural products implies an oxidative coupling between indoles and phenols. Therefore, we wished to develop a bioinspired synthesis of benzofuroindoline core.Inspired by the biosynthesis of azonazine and diazonamide A, we developed an diastereodivergent arylation of tryptophan by tyrosine. The existing synthetic methodology of benzofuroindoline involving an oxidative coupling do not allow a stereoselective control. We solved this problem by doing a Friedel-Crafts reaction between a protected tyrosine and the exo-, and endo-bromopyrroloindolines obtained stereoselectively from tryptophan. This reaction witch proceeds with a retention of configuration allowed us to access selectively azonazine and diazonamide A precursors. A general methodology of benzofuroindoline synthesis by an oxidative coupling between 2,3-disubstituted indoles and phenols has then been developed. This reaction proceeds by oxidation of the indole with N-iodosuccinimide. The resulting iodoindoline was then engaged in a Friedel-Crafts reaction with a phenol in presence of a silver salt to form the desired benzofuroindoline in a one-pot operation. Through this method, a library of several benzofuroindolines has been created.This last methodology has been applied to the synthesis of complex hexacyclic voacalgine A and bipleiophylline analogs from pleiocarpamine-like indoles. Another strategy towards the voacalgine A and bipleiophylline benzofuroindoline core has also been studied and involves the oxidation of a catechol into an orthoquinone which can react with an indole.
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Natacha Denizot. Couplages oxydants entre indoles et phénols pour la synthèse de benzofuroindolines naturelles. Chimie organique. Université Paris-Saclay, 2015. Français. ⟨NNT : 2015SACLS147⟩. ⟨tel-01683135⟩

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