Noroleanane triterpenoids from the aerial parts of Lantana camara

Two novel triterpenoids, lantadienone (1) and camaradienone (2), were isolated from the aerial parts of Lantana camara, along with seven known compounds, lantadene A, lantadene B, β-sitosterol 3-(β-D- glucopyranoside), camaric acid, lantanilic acid, lantanolic acid, and camangeloyl acid. Their structures were elucidated as (3β,22β)-3,25- epoxy-3-hydroxy-22-{[(2Z)-2-methyl-1-oxobut-2-enyl]oxy}-28-noroleana-12, 17-dien-11-one (1) and (3β)-3,25-epoxy-3-hydroxy-28-noroleana-12,17-dien- 11-one (2), respectively, by means of spectral studies. The triterpenoids 1 and 2 represent 28-noroleananes oxidized at C(11) and C(22) or at C(11), reported for the first time.