Two prenylated and C-methylated flavonoids from Tripterygium wilfordii.

Two unusual prenylated and C-methylated flavanones, (±)-5,4'-dihydroxy-2'-methoxy-6',6''- dimethypyrano-(2'',3'':7,8)-6-methyflavanone ( 1) and (2 S)-5,7,4'-trihydroxy-2'-methoxy-8,5'- di(3-methyl-2-butenyl)-6-methyflavanone ( 2), and 10 known compounds were isolated from the stems and roots of TRIPTERYGIUM WILFORDII. Their structures were elucidated based on spectroscopic analyses including 1- and 2-D NMR, HR-ESI-MS, CD, and x-ray crystallography. The anti-inflammatory, antiproliferative, and antibacterial activities of compounds 1 and 2 were investigated. Compound 2 had an inhibitory effect on lipopolysaccharides (LPS)-triggered RAW cell nitric oxide (NO) production, with an IC (50) value of 15.0 ± 0.7  µM. Both compounds showed moderate antiproliferative activity against the tumor cell lines HT-29 and ZR-75-1. © Georg Thieme Verlag KG Stuttgart · New York.