In vitro: |
Helvetica Chimica Acta, 2013, 96(6):1182-1187. | Unusual Guaiane Sesquiterpenoids from Artemisia rupestris.[Reference: WebLink] | METHODS AND RESULTS: Two new guaiane sesquiterpenoids, (1β,5β)-1-hydroxyguaia-4(15),11(13)-dieno-12,5-lactone (1) and 1,5-epoxy-4-hydroxyguai-11(13)-en-12-oic acid (2), together with five known compounds, rupestonic acid (3), strobilactone A (4), Antiquorin (5), isosclerone (6), and 5-hydroxy-2′,3′,4′,7,8-pentamethoxyflavone (7), were isolated from a 95% EtOH extract of Artemisia rupestris. Compounds 1 and 2 are rare examples of guaiane sesquiterpenoids, incorporating a 12,5-lactone group or featuring a 1,5-epoxy ring, respectively. The structures of 1 and 2 were identified by various spectroscopic methods. CONCLUSIONS: Compounds 1, 4, and 5 exhibited moderate cytotoxic activities against the human lung cancer 95-D cell line with IC50 values of 11.3, 19.8, and 34.5 μM, respectively. |
|