Crotocascarins I-K : Crotofolane-Type Diterpenoids, Crotocascarin γ, Isocrotofolane Glucoside and Phenolic Glycoside from the Leaves of Croton cascarilloides

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  • Kawakami Susumu
    Department of Natural Products Chemistry, Faculty of Pharmacy, Yasuda Women’s University
  • Matsunami Katsuyoshi
    Department of Pharmacognosy, Graduate School of Biomedical and Health Sciences, Hiroshima University
  • Otsuka Hideaki
    Department of Natural Products Chemistry, Faculty of Pharmacy, Yasuda Women’s University Department of Pharmacognosy, Graduate School of Biomedical and Health Sciences, Hiroshima University
  • Inagaki Masanori
    Department of Natural Products Chemistry, Faculty of Pharmacy, Yasuda Women’s University
  • Takeda Yoshio
    Department of Natural Products Chemistry, Faculty of Pharmacy, Yasuda Women’s University
  • Kawahata Masatoshi
    Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Tokushima Bunri University Kagawa Campus
  • Yamaguchi Kentaro
    Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Tokushima Bunri University Kagawa Campus

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  • Crotocascarins I–K: Crotofolane-Type Diterpenoids, Crotocascarin γ, Isocrotofolane Glucoside and Phenolic Glycoside from the Leaves of <i>Croton cascarilloides</i>

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From the 1-BuOH-soluble fraction of a methanol (MeOH) extract of the leaves of Croton cascarilloides, crotofolanes: crotocascarins I–K, nor-crotofolane: crotocascarin γ, isocrotofolane glucoside and phenolic glycoside were isolated by a combination of various separation techniques. Their structures were elucidated mainly from the NMR spectroscopic evidence. The structure of crotocascarin K was first elucidated by spectroscopic analysis and then was confirmed by X-ray crystallographic analysis. Its absolute structure was finally determined by the modified Mosher’s method. Isocrotofolane glucoside was found to possess a new skeleton, however, its absolute structure remains to be determined.

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