New triterpenoids from Lantana camara:: Isomerisation of the angeloyl moiety of lantadene A during catalytic hydrogenation

Two new triterpenes, 22 beta-tigloyloxylantanolic acid (5) and 22 beta-dimethylacryloyloxylantic acid (6) have been isolated along with 22 beta-angeloyloxylantanolic acid (4) and 24-hydroxy-3-oxoolean-12-en-28-oic acid (7) from the leaves of the Common Pink variety of Lantana camara var. aculeata and their structures elucidated by spectroscopic methods. C-13 NMR spectral data assignments of lantadenes A, B and C isolated from the red variety of the plant and isomerization of the angeloyl moiety of lantadene A to tigloyl moiety to yield a new product 22 beta-tigloyloxy-3-oxoolean-12-en-28-oic acid (10) during catalytic hydrogenation are also reported.