Total Synthesis and Structure–Activity Relationship Studies of Phelligridins C and D, and Phellifuropyranone A

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  • Takayuki Ohyoshi
    Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571 , Japan
  • Keisuke Mitsugi
    Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571 , Japan
  • Fumitaka Ichimura
    Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571 , Japan
  • Tatsuya Higuma
    Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571 , Japan
  • Masahito Yoshida
    Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571 , Japan
  • Hideo Kigoshi
    Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571 , Japan

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<jats:title>Abstract</jats:title> <jats:p>α-Pyrone polyphenols, phelligridins C and D (meshimakobnols B and A), and phellifuropyranone A, isolated from a Japanese mushroom, are growth inhibitors of cancer cells. Herein, we report full details of the total synthesis of phelligridins C and D. The key reactions of the synthetic pathways were Pd catalyzed cross-coupling and aldol-type condensation. This strategy also enabled the total synthesis of phellifuropyranone A and artificial analogs of phelligridins. Subsequent biological evaluation of these compounds clarified that the whole skeleton of phelligridin C and the catechol group of the left hand side are essential for the cytotoxicity.</jats:p>

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