Two new tetrahydroprotoberberine N-oxides, 7R,14S-cis-tetrahydrocoptisine N-oxide (1) and 7R,14R-trans-tetrahydrocoptisine N-oxide (2) along with fourteen known compounds (3–16) were isolated from the aerial parts of Chelidonium majus. Their structures were elucidated by spectroscopic and spectrometric methods, such as 1D and 2D-NMR (HSQC, HMBC, NOESY) and HRESIMS. The absolute configurations of 1 and 2 were established by comparison of their experimental and calculated ECD data. All isolates were evaluated for their inhibitory effects on the nitric oxide production in LPS-induced RAW 264.7 macrophages, and compounds 2, 6–10, 13, and 15 showed significant inhibitory effects with the IC50 values ranging from 1.1–31.9 μM.
- Chelidonium majus
- Nitric oxide, tetrahydrocoptisine N-oxide
ASJC Scopus subject areas
- Agronomy and Crop Science
- Plant Science