Crotofolane-Type Diterpenoids, Crotocascarins L–Q, and a Rearranged Crotofolane-Type Diterpenoid, Neocrotocascarin, from the Stems of Croton cascarilloides

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  • Kawakami Susumu
    Department of Natural Product Chemistry, Faculty of Pharmacy, Yasuda Women’s University
  • Inagaki Masanori
    Department of Natural Product 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 Product 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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  • Crotofolane-Type Diterpenoids, Crotocascarins L–Q, and a Rearranged Crotofolane-Type Diterpenoid, Neocrotocascarin, from the Stems of <i>Croton cascarilloides</i>

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<p>From the stems of Croton cascarilloides, further crotofolane-type diterpenoids, named crotocascarins L–Q (1–6), and a rearranged one (7), named neocrotocascarin were isolated. Their structures were elucidated from spectroscopic evidence. Also, the structures of crotocascarin O (4) and neocrotocascarin (7) were determined by X-ray crystallographic analyses. As a result, neocrotocascarin (7) was found to possess a new carbon framework. A plausible mechanism for the formation of neocrotocascarin (7) is also discussed.</p>

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