Apotirucallane triterpenoids from Luvunga sarmentosa (Rutaceae).
The leaves of Luvunga sarmentosa (Bl.) Kurz. yielded eight apotirucallane triterpenoids named luvungins A-G, and 1alpha-acetoxyluvungin A. Characteristic of the structure are the seven-membered lactone-ring A, the alpha-hydroxyl or alpha-acetoxyl group at C-7 and an oxygen bridge in the side chain giving five-, six- or seven-membered rings, respectively. Because of a hemiacetal function at C-21, luvungin C occurred as a mixture of 21-epimers. The structures have been elucidated on the basis of MS and NMR spectral data. In addition, two known coumarins ostruthin (6-geranyl-7-hydroxycoumarin) and 8-geranyl-7-hydroxycoumarin as well as five known triterpenes friedelin, flindissone, melianone, niloticin and limonin were isolated.
Institute of Chemistry, National Centre for Natural Science and Technology of Vietnam, Hoang Quoc Viet Road, Cau Giay, Hanoi, Viet Nam.
Trinh Phuong
TP
Lien
Christine
C
Kamperdick
Juergen
J
Schmidt
Guenter
G
Adam
Tran
T
Van Sung
D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry; D027821:Rutaceae / Q000737:chemistry*; D013057:Spectrum Analysis; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
D014315:Triterpenes