Isolation and structures of new cyclomyltaylane and ent-chamigrane-type sesquiterpenoids from the liverwort Reboulia hemishaerica and their biotransformation by the fungus Aspergillus niger |
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| Authors: | Furusawa Mai Hashimoto Toshihiro Noma Yoshiaki Asakawaa Yoshinori |
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| Affiliation: | Faculty of Pharmaceutical Sciences, Tokushima Bunri University; Tokushima Bunri University; Yamashiro-cho, Tokushima 770-8514, Japan. |
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| Abstract: | Reboulia hemisphaerica, the thalloid liverwort, contained four new cyclomyltaylane- and two new ent-beta-chamigrane-type sesquiterpenoids of which the absolute stereostructures were established by a combination of two-dimensional NMR spectroscopy, X-ray crystallographic analysis, and the modified Mosher's method. Cyclomyltaylan-5alpha-ol and ent-beta-chamigren-1alpha-ol were biotransformed by the fungus Aspergillus niger to afford new oxygenated matabolites. Their structures were also elucidated in the same manner as described above. |
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