Agallochins J-L, new isopimarane diterpenoids from Excoecaria agallocha L.

The ethyl acetate extract of Excoecaria agallocha L. furnished three more new isopimarane diterpenoids, 11alpha,14alpha-dihydroxy-7,15-isopimaradien-3-one, agallochin J (1), 3alpha, 1alpha,14alpha-trihydroxyisopimara-7,15-diene, agallochin K (2) and 6alpha,14alpha,17-trihydroxy-7,15-isopimaradien-3-one, agallochin L.

ent-Kaurane and beyerane diterpenoids from Excoecaria agallocha.

The roots of Excoecaria agallocha yielded four new diterpenoids, ent-3 beta,20-epoxy-3 alpha,6 alpha-dihydroxykaur-16-ene (agallochin F) (1), 3beta,20-epoxy-3 alpha-hydroxybeyer-15-ene (agallochin G) (2), 3 beta,20:15R,16S-diepoxy-3 alpha-beyeranol (agallochin H) (3), and 3 beta,20-epoxy-3 alpha,6 alpha-dihydroxy-18-nor-beyer-15-ene (agallochin I) (4), along with three known derivatives, 2-acetoxy-1,15-beyeradiene-3,12-dione (5), 2-hydroxy-1,15-beyeradiene-3,12-dione (6), and ent-kauran-16 beta-ol-3-one. The structures of 1-4 were determined by spectroscopic (NMR and MS) data interpretation.