Improved synthesis of the polyhydroxylated central part of phoslactomycin B |
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Authors: | Hisato Nonaka |
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Institution: | Department of Biomolecular Engineering, Tokyo Institute of Technology, Box B52, Nagatsuta-cho 4259, Midori-ku, Yokohama 226-8501, Japan |
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Abstract: | A new approach to the C(7)-C(13) intermediate for the synthesis of phoslactomycin B was investigated. Asymmetric dihydroxylation of the β,γ-unsaturated ester proceeded cleanly to afford the β-hydroxyl-γ-lactone with 97.6% ee, which upon protection as the PMB ether followed by hydride reduction furnished a diol. After selective protection of the prim-OH, oxidation of the sec-OH and chelation-controlled addition of CH2 CHMgBr afforded the C(7)-C(11) segment. Later on, the C(11) stereocentre was constructed by the asymmetric transfer hydrogenation using the Noyori catalyst. |
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Keywords: | Phoslactomycin B Chelation-controlled addition Asymmetric dihydroxylation Asymmetric transfer hydrogenation |
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