摘要:
Two novel spirooliganones A (1) and (2), a pair of Spiro carbon epimers, with a rare dioxaspiro skeleton were isolated from the roots of illicium oligandrum. The structures were fully determined by spectroscopic analysis and chemical methods, especially modified Mosher's method, and X-ray diffraction analysis. Spirooliganone B was found to exhibit more potent activities against coxsackie virus B3 and influenza virus A (H3N2) (IC50 3.70-5.05 mu M) than spirooliganone A. The biosynthetic pathway involving a hetero-Diels-Alder reaction of the epimers was proposed.