Enantioselective Synthesis of Planar-Chiral Transition-Metal Complexes by Homogeneous Olefi n-Metathesis Reactions and Their Application in Asymmetric Catalysis

  • Ogasawara Masamichi
    Department of Natural Science, Graduate School of Science and Technology, Tokushima University

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  • 均一系オレフィン・メタセシス反応による面不斉遷移金属錯体のエナンチオ選択的合成法の開発と不斉触媒反応への応用
  • キンイツケイ オレフィン ・ メタセシス ハンノウ ニ ヨル メン フセイ センイ キンゾク サクタイ ノ エナンチオ センタクテキ ゴウセイホウ ノ カイハツ ト フセイ ショクバイ ハンノウ エ ノ オウヨウ

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<p>Planar-chiral transition-metal complexes are important chiral scaffolds in organic and organometallic chemistry and have been utilized as chiral ligands, chiral catalysts, or chiral building blocks. In spite of the usefulness of the planar-chiral species in asymmetric synthesis, enantiomerically enriched forms of these compounds are primarily obtained by rather classical methods. Indeed, examples of catalytic enantio-control of planar chirality in transition-metal complexes have been extremely rare, and this has been still a developing area in this fi eld. In this account, recent results from our research group on the catalytic asymmetric synthesis of various planar-chiral transition-metal complexes are outlined. The Mo-catalyzed asymmetric ring-closing metathesis has been found to be a powerful method to control the planar chirality in various transition-metal complexes such as ferrocenes, ruthenocenes, (π-arene)chromium complexes, cymantrene derivatives, etc. Application of the highly enantiomerically enriched planar-chiral complexes in asymmetric synthesis has been also demonstrated.</p>



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