Triterpenoids from Eugenia grandis: structure elucidation by NMR spectroscopy.

Magnetic resonance in chemistry : MRC

PubMedID: 17226892

Manoharan KP, Song FJ, Benny TK, Yang D. Triterpenoids from Eugenia grandis: structure elucidation by NMR spectroscopy. Magn Reson Chem. 2007;45(3):279-81.
A new pentacyclic triterpenoid, 2alpha,3beta-dihydroxylup-12-en-28-oic acid (1) and a rarely encountered pentacyclic triterpenoid, 3beta-hydroxylup-12-en-28-oic acid (2), together with five known compounds, friedelin (3), 3beta-friedelinol (4), betulinic acid (5), oleanolic acid (6) and beta-sitosterol (7) were isolated from the chloroform extract of stem bark of Eugenia grandis (Syn: Syzygium grande). The structure and stereochemistry of the new compound (1) and the rarely encountered compound (2) were established by 1D and 2D NMR spectroscopic techniques. All the above isolated compounds from this plant are reported for the first time.