Transformations of Manool. Tri- and Tetracyclic Norditerpenoids with <i>in Vitro</i> Activity against <i>Plasmodium falciparum</i>
作者:Albert W. W. van Wyk、Kevin A. Lobb、Mino R. Caira、Heinrich C. Hoppe、Michael T. Davies-Coleman
DOI:10.1021/np0701071
日期:2007.8.1
The known 17-norisopimar-15-ene-8 beta,13 beta-diol (5) and five new semisynthetic norditerpenoids, ethyl 17-norabiet-13(15)-E-en-8 beta-ol-16-oate (6), ethyl 17-norabiet-13(15)-Z-en-8 beta-ol-16-oate (7), 17-norpimaran-13 alpha-ethoxy-8,16-olactone (8), 17-norisopimarane-8 beta,15-diol (9), and 17-norarabiet-13(15)-ene-8 beta,16-diol (10), were prepared from manool (11). Standard spectroscopic data including X-ray crystal analysis were used to determine the structures of 5-10. All five compounds exhibited in vitro antiplasmodial activity against the malarial parasite Plasmodium falciparum at varying mu g mL(-1) concentrations.
Stereoselective conversion of keto groups into methyl vinyl quaternary carbon centers
作者:Brian L. Buckwalter、Ivor R. Burfitt、Hugh Felkin、Monique Joly-Goudket、K. Naemura、Mary F. Salomon、Ernest Wenkert、Peter M. Wovkulich