- Synthesis of cyclic compounds
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A method for the preparation of a compound of formula (II) wherein R1 and R2 are independently H, alkyl, alkoxy, oxoalkyl, alkenyl, aryl or arylalkyl whether unsubstituted or substituted, optionally interrupted by one or more hetero atoms, straight chain or branched chain, hydrophilic, hydrophobic or fluorophilic; R3, R4, R5 and R6 are independently or all hydrogen or halogen; provided that at least two of the R3, R4, R5 and R6 are halogens.
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- Further new rearranged lanostanoids from the seeds of Abies mariesii and A. firma
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In addition to reported 17,14-friedolanostane type (I) of triterpene further triterpenes having new rearranged lanostane skeletons, 17,13-friedolanostane (II) and 8(14→13R)abeo-17,13-friedolanostane (III), have been isolated from the seed of Abiesmariesii. The skeletons I and II were also found to occur in A.firma. Their structures have been elucidated by spectral and X-ray diffraction analyses.
- Hasegawa, Shinichi,Miura, Tadayoshi,Kaneko, Nobutada,Hirose, Yoshiyuki,Iitaka, Yoichi
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p. 1775 - 1784
(2007/10/02)
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