Two new 11alpha,12alpha-epoxy-ursan-28,13beta-olides and other triterpenes from Cecropia catharinensis.

摘要

Three new triterpenes, 2alpha-acetoxy-3beta,19alpha-dihydroxy-11alpha,12alpha-epoxy-ursan-28,13beta-olid e, 3beta-acetoxy-2alpha,19alpha-dihydroxy-11alpha,12alpha-epoxy-ursan-28,13beta-olid e and 2-O-acetyl-euscaphic acid together eight known triterpenes were isolated from the roots and stems of Cecropia catharinensis. Their structures were determined by detailed analysis of NMR spectra and the relative configurations established by difference nOe experiments. In addition, four flavonoid glucosides (vitexin, isovitexin, orientin and isoorientin) were found in the leaves.