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FACULTÉ DE CHIMIE
UPMC UFR 926

" New Phospha-helicenes: Synthesis and Applications in Asymmetric Catalysis " on Monday November 13th 2017

Arnaud Voituriez 

CNRS-ICSN, Gif-sur-Yvette

arnaud.voituriez @ cnrs.fr

 

Abstract:

 

Over the past few years, helicenes have attracted considerable attention due to their wide potential, notably in materials science. However, molecular scaffolds with helical chirality have been rarely used for building phosphorus ligands and catalysts. In this context, our goal was to access unprecedented chiral auxiliaries for organo- and organometallic catalysis. We have synthesized new phospha-helicenes, where the phosphorus moiety is embedded at the end of the helical structure, following two strategies: the photochemical oxidative cyclization of diaryl olefins and the nickel-catalyzed [2+2+2] cyclotrimerization reaction. The corresponding gold complexes of these phosphahelicenes were isolated, characterized and evaluated in enantioselective enyne, allen-ene and allene-diene cyclizations.

06/11/17

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