Two 24-nor-lupane triterpenoids: 24-nor-11 alpha-hydroxy-3-oxo-lup-20(29)-ene-28-oic acid (1), 24-nor-3 alpha,11alpha dihydroxy-lup-20(29)-ene-28-oic acid (2) were isolated from the dichloromethane extract of the aerial part of Acanthopanax trifoliatus collected in Mai Chau, Hoa Binh province with high amount (0.26 and 0.25 percent of dried plant material, respectively). From compound 1, three derivatives as new compounds have been synthesized. The structures of the isolated and synthesized compounds were elucidated by analysis of MS, NMR spectra and comparison with the published data.