Synthesis 2008(16): 2636-2644  
DOI: 10.1055/s-2008-1067194
SPECIALTOPIC
© Georg Thieme Verlag Stuttgart ˙ New York

Iron-Catalyzed Alkenylation of Grignard Reagents by Enol Phosphates

Gérard Cahiez*, Olivier Gager, Vanessa Habiak
Laboratoire de Synthèse Organique Sélective et de Chimie Organométallique (SOSCO), UMR 8123 CNRS-UCP-ESCOM, 5 Mail Gay-Lussac, Neuville sur Oise, 95031 Cergy-Pontoise cedex, France
e-Mail: gerard.cahiez@u-cergy.fr;
Further Information

Publication History

Received 20 March 2008
Publication Date:
24 July 2008 (online)

Abstract

Stereoselective preparation of trisubstituted olefins can be easily performed from an Z/E-mixture of enol phosphates by reacting only the E-isomer with a Grignard reagent in the presence of Fe(acac)3. This procedure combines a kinetic differentiation and a stereoselective reaction. The coupling is very chemoselective in the presence of an alkyl chloride, an ester, a ketone or a nitrile.

14

See, for instance, ref. 10f