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Novel sesquiterpenes from alpinia intermedia gagnep

, : Novel sesquiterpenes from alpinia intermedia gagnep. Chemical & Pharmaceutical Bulletin (Tokyo) 35(7): 2860-2868

Three novel sesquiterpene peroxides, hanalpinol peroxide (I),isohanalpinol (II), and aokumanol (III), a new secoguaiane-type sesquiterpene, epialpinolide (IV), and a new elemophilane-type sesquiterpene, .DELTA.11(12)-eremophilen-10.beta.-ol (V), have been isolated from the rhizomes of Alpinia intermedia together with eight known sesquiterpenes, hanalpinol (VI), hanalpinone (VII), isohanalpinone (VIII), alpinenone (IX), furopelargone B (X), furopelargone A (XI), intermedeol (XII) and .beta.-selinene (XIII). The structures of I-V were determined by spectroscopic methods, chemical conversion, and X-ray analysis. Their biosynthetic relationships are discussed. From the point of view of chemotaxonomy, it is suggested that Alpinia intermedia and Alpinia japonica are closely related plants.


DOI: 10.1248/cpb.35.2860

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