title: New taxane diterpenoids from the roots of Taxus mairei.
abstract: Two new taxoids, taxumairols A (1) and B (2), have been isolated from extracts of the roots of Formosan Taxus mairei (Lemee & Levl.) S. Y. Hu. The structures of 1 and 2 were identified as 5 alpha, 7 beta, 9 alpha, 10 beta, 13 alpha-pentaacetoxy-20-(benzoyloxy)- 2 alpha, 4 alpha-dihydroxytax-11-ene and 2 alpha, 5 alpha, 10 beta,-13 alpha-tetraacetoxy-1 beta, 7 beta, 9 alpha-trihydroxy-4 beta,20-epoxytax-11-ene, primarily on the basis of 1D- and 2D-NMR techniques including DEPT, COSY, and HMBC experiments, as well as chemical correlation with known compounds. Taxumairol A (1) exhibited significant cytotoxicities against murine P-388 and human KB-16, A-549, and HT-29 tumor cell lines.
authors.affiliation: Institute of Marine Resources, National Sun Yat-Sen University, Taiwan, Republic of China.
authors.forename: Y C
authors.initials: YC
authors.lastname: Shen
authors.forename: H R
authors.initials: HR
authors.lastname: Tai
authors.forename: C Y
authors.initials: CY
authors.lastname: Chen
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000302:isolation & purification* / Q000494:pharmacology; D019073:HT29 Cells; D006801:Humans; D007624:KB Cells; D007941:Leukemia P388 / Q000188:drug therapy; D051379:Mice; D017239:Paclitaxel / Q000031:analogs & derivatives* / Q000302:isolation & purification / Q000494:pharmacology; D010936:Plant Extracts / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry*; D013624:Taiwan; D043823:Taxoids
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D010936:Plant Extracts; D043823:Taxoids; C102775:taxumairol A; C102776:taxumairol B; D017239:Paclitaxel