光学活性コバルト錯体を触媒とする不斉シクロプロパン化反応と反応機構解析に基づく触媒設計 Enantioselective Cyclopropanation Reaction Catalyzed by Optically Active Cobalt(II) Complexes and the Catalyst Design based on Theoretical Analysis

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Highly enantioselective cyclopropanation of styrene derivatives and diazoacetates was effectively catalyzed by ketoiminatocobalt(II) complexes. Addition of a catalytic amount of N-methylimidazole significantly accelerated the reaction and enhanced the enantioselectivity due to its coordination to the center cobalt atom of the complex as an axial ligand. Analysis of the transition states by the PM 3 (tm) method indicated that the olefin approached parallel to the cobalt-carbene bond with bisecting an O-Co-O angle. The reaction pathway of the cyclopropanation was analyzed by the density functional method to reveal that the axial donor ligand produced two prominent effects. One is that the activation energy for the formation of the cobalt carbene complex was reduced and that the activation energy for the cyclopropanation step was increased. The other is that the distance of the carbene carbon above the ligand plane was shortened during the cyclopropanation step. It was revealed that the carbene-carbon bond of the ketoiminatocobalt-carbene complexes is characterized as an extraordinary single bond based on the theoretical and FT-IR analysis. The key reactive intermediate of borohydride reduction catalyzed by Schiff base-cobalt com-plexes is proposed to be the dichloromethyl-cobalt hydride with a sodium cation, based on experimental and theoretical studies. It was revealed that chloroform is not the solvent but the reactant that activates the cobalt catalyst. It was found that a catalytic amount of chloroform effectively activated the present catalytic system to convert various ketones into the corresponding reduced product with a high ee in the THE solvent. Furthermore, the theoretical simulation of various axial groups in cobalt complex catalysts predicted that the cobalt-carbene complexes could be employed as efficient catalysts. The newly designed complexes generated from cobalt complex and methyl diazoacetate made it possible to catalyze the enantioselective borohydride reduction in a halogen-free solvent.

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  • 有機合成化学協会誌 : JOURNAL OF Synthetic Organic Chemistry JAPAN

    有機合成化学協会誌 : JOURNAL OF Synthetic Organic Chemistry JAPAN 66(2), 110-123, 2008-02-01

    The Society of Synthetic Organic Chemistry, Japan

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