Transformations of Manool. Tri- and Tetracyclic Norditerpenoids with in Vitro Activity against Plasmodium falciparum
摘要:
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.