Abstract:
The chemical constituents from
Uncaria rhynchophylla were isolated and purefied by column chromatography on silica gel, aluminum oxide, Sephadex LH-20 and HPLC. The structure of the compounds were elucidated by spectral analysis. Eighteen compounds were isolated and identified, including dihyrdocorynantheine (
1 ), isocorynantheidine (
2 ), hirsutine (
3 ), corynantheine (
4 ), hirsuteine (
5 ), geissoschizine methyl ether (
6 ), villocarine A (
7 ), 16
R-
E-isositsirikine (
8 ), sitsirikine (
9 ), 19, 20-dihydroisositsirikine (
10 ), hirsuteine N-oxide (
11 ), geissoschizine N-oxide methyl ether (
12 ), corynoxine (
13 ), isorhynchophyllic acid (
14 ), isocorynoxeine (
15 ), corynoxine B (
16 ), corynoxeine (
17 ), akuammigine (
18 ). Compound
2, 7, 8 and
10 were first isolated from
Uncaria rhynchophylla. And compound
13 showed modest anti-inflammatory activity.