[Terpenoids from leaves of Aeschynanthus mengxinensis].
OBJECTIVE
To study the chemical constituents from the ethyl acetate portion of an ethanolic extractive of the leaves of Aeschynanthus mengxinensis.


METHODS
The column chromatographic techniques were applied to isolate constituents. A combination of IR, ESI-MS, NMR and 2D-NMR spectroscopy was used to identify structures.


RESULTS
Four compounds were isolated from the ethyl acetate fraction of this plant, and the structure of them have identified as 2alpha, 3beta, 19beta-trihydroxyolean-12-ene-23,28-dioic acid (1), 2alpha, 3beta, 21beta-trihydroxyolean-12-ene-28-oic acid (2), 2alpha, 3beta, 23-trihydroxyurs-12-ene-28-oic acid (3) and stigmast-5 (6), 22 (23)-diene-3beta-ol (4).


CONCLUSIONS
The NMR data of compound 1 was completely assigned by 2D-NMR techniques, including HMBC and HMQC. Compounds 1-4 were isolated for the first time from Gesneriaceae.
Kang
Wen-yi
WY
Institute of Natural Products, Henan University, Kaifeng 475004, China. kangweny@hotmail.com
Zang
Xin-yan
XY
Wang
Jin-mei
JM
Xu
Qi-tai
QT
D004365:Drugs, Chinese Herbal / Q000737:chemistry; D019684:Magnoliopsida / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D013729:Terpenes / Q000737:chemistry*
D004365:Drugs, Chinese Herbal; D013729:Terpenes