Synthesis 2016; 48(19): 3309-3316
DOI: 10.1055/s-0035-1562448
paper
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Atropisomeric MeOBIPHEP Analogues and Their Application in Silver-Catalyzed Cycloisomerization of Allenols

Florent Le Boucher d’Herouville
a   PSL Research University, Chimie ParisTech - CNRS, Institut de Recherche de Chimie Paris, 11 rue P. et M. Curie, 75005 Paris, France   eMail: veronique.michelet@chimie-paristech.fr
,
Anthony Millet
a   PSL Research University, Chimie ParisTech - CNRS, Institut de Recherche de Chimie Paris, 11 rue P. et M. Curie, 75005 Paris, France   eMail: veronique.michelet@chimie-paristech.fr
,
Michelangelo Scalone*
b   Process Research & Development CoE Catalysis, F. Hoffmann-La Roche AG, 4070 Basel, Switzerland   eMail: michelangelo.scalone@roche.com
,
Véronique Michelet*
a   PSL Research University, Chimie ParisTech - CNRS, Institut de Recherche de Chimie Paris, 11 rue P. et M. Curie, 75005 Paris, France   eMail: veronique.michelet@chimie-paristech.fr
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Publikationsverlauf

Received: 19. Mai 2016

Accepted after revision: 06. Juni 2016

Publikationsdatum:
26. Juli 2016 (online)


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In memory of Professor Jean Normant with deep and profound respect

Abstract

The preparation of novel MeOBIPHEP atropisomeric chiral congener ligands via an efficient palladium-catalyzed P–C coupling key step is described. We demonstrate that these palladium-catalyzed conditions are compatible with the brominated MeOBIPHEP backbone. The reaction conditions for asymmetric silver-catalyzed cycloisomerization of γ-allenols were optimized, leading to the first enantioselective catalytic system employing atropisomeric diphosphine ligands as the chiral inducer. The process follows a major 5-exo cyclization via addition of the alcohol moiety to the π-activated allenyl intermediate, leading to vinyltetrahydrofurans with enantiomeric ratios up to 91.5:8.5.

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