Manganese porphyrin catalyzed cycloisomerization of enynes |
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Authors: | Ozawa Takuya Kurahashi Takuya Matsubara Seijiro |
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Institution: | Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan. |
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Abstract: | Cycloisomerization of 1,6-enynes to five- or six-membered ring systems is successfully carried out in the presence of a cationic manganese(III) catalyst. The use of a structurally rigid tetradentate porphyrin as the equatorial ligand and a weakly coordinating axial ligand is the key to bringing out the catalytic reactivity of manganese for the reaction. The axial ligand of the catalyst has a marked effect on the product and selectively aids the formation of five- or six-membered cyclic products. |
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