| Summary: | 碩士 === 國立中山大學 === 生物科學系研究所 === 94 === Abstract
In recent years, Taxus species have attracted a great interest because Paclitaxel, an anticancer agent, was isolated from T.brevifolia. Since the discovery of Paclitaxel many new taxane diterpenes from various Taxus species were isolated. In order to discover new taxoids, twigs and leaves of Taxus sumatrana (Miq.) de Laub. Growing in Taiwan were employed. Chromatographic separation of acetone extract of the leaves and twigs of the plant has yielded four taxane diterpenes and one derivative, designated tasumatrol M (1), tasumatrol N (2), tasumatrol O (3) and 7-deacetyl-canadensene (4). All structures were established primarily on the basis of 1D and 2D NMR techniques, including DEPT, COSY, HMBC and NOESY experiments. Compound 1, 2 and 3 were inactive as tested against human KB, Hepa59T, Hela, DLD-1 and WiDr tumor cell lines. Compounds 1 and 2, possessing a bicyclic skeleton, together with compounds 3 were new compounds from natural source. The possible biosynthetic pathway of compounds 1 and 2 were derived from
geranylgeranyl pyrophosphate and verticillene.
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