Cationic Planar Chiral (η 6 -Arene)Mn(CO) 3 + Complexes: Resolution, NMR Study in Chiral-Oriented Solvents, and Applications to the Enantioselective Synthesis of 4-Substituted Cyclohexenones and (η6 -Phosphinoarene)Mn(CO)3+ Complexes

Antoine Eloi 1 Françoise Rose-Munch 1 Eric Rose 2 Ariane Pille Philippe Lesot 3, 4, * Patrick Herson
* Corresponding author
1 UPMC - Université Pierre et Marie Curie - Paris 6
2 IPCM - Institut Parisien de Chimie Moléculaire
3 ICMMO - Institut de Chimie Moléculaire et des Matériaux d'Orsay
4 CNRS - Centre National de la Recherche Scientifique
Abstract : An easy round-trip of (D)-(þ)-camphor enolate to a racemic mixture of cationic (η6-arene)Mn-(CO)3 complexes is the base of the strategy adopted for the first resolution of such complexes. X-ray structures of one of the (η5-cyclohexadienyl)Mn(CO)3 diastereoisomers obtained after addition of the chiral auxiliary as well as of the corresponding enantiopure η6 cationic complex after rearomatization have been established. Proton-decoupled deuterium 2D NMR in chiral polypeptide liquid crystals proved to be an efficient tool for the determination of the enantiomeric purity of such planar chiral cationic η6 complexes. The potential of this unprecedented resolution is exemplified by enantioselective syntheses in organic and organometallic fields. Thus, starting from the enantiopure (η6-meta-halogenoanisole)Mn(CO)3 complexes, enantiopure 2,4-disubstituted cyclohexenones were easily generated through a Mn-assisted dearomatization process, and the first examples of enantiopure η5- and η6-phosphino-substituted Mn complexes were obtained through lithiation/ electrophilic quench sequence.
Keywords : NMR Enantiodiscrimination Polypeptide Liquid crystals PBLG Chiral complex
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Journal articles
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https://hal.archives-ouvertes.fr/hal-02316048
Contributor : Philippe Lesot <>
Submitted on : Tuesday, October 15, 2019 - 9:37:38 AM
Last modification on : Thursday, October 24, 2019 - 3:56:48 PM

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Antoine Eloi, Françoise Rose-Munch, Eric Rose, Ariane Pille, Philippe Lesot, et al.. Cationic Planar Chiral (η 6 -Arene)Mn(CO) 3 + Complexes: Resolution, NMR Study in Chiral-Oriented Solvents, and Applications to the Enantioselective Synthesis of 4-Substituted Cyclohexenones and (η6 -Phosphinoarene)Mn(CO)3+ Complexes. Organometallics, American Chemical Society, 2010, 29 (17), pp.3876-3886. ⟨10.1021/om100564v⟩. ⟨hal-02316048⟩

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