Studies on the Himalayan yew Taxus wallichiana: Part VII - The taxoids and phenolic constituents of the roots of Taxus wallichiana t

The systematic investigation on the roots of Taxus wallichiana has resulted in the isolation of nine taxoids-taxol 1 baccatin III 2, baccatin IV 3, taxusin 4, a C-14 oxygenated taxoid 5, I~-hydroxybaccatin 16, pentaacetoxy taxadiene 7, a dibenzoylated rearranged taxoid 8, 7-xylosyl-1 O-deacetyl-taxol C 9 and three phenolic compounds (-) seco-isolariciresinol 11, taxiresinol 12 and isotaxiresinol 13. The compounds have been characterized on the basis of their spectral characterist ics. The occurrence of taxoid 9 in the roots of the plant is quite significant. The distribution of the above compounds in other parts of the plant are also summarized.