Three new alkaloids from Xylopia vielana and their antiinflammatory activities.

Three new aporphine alkaloids, xylopialoids A-C (1-3), along with three known aporphine alkioids (4-6) and three other known compounds (7-9) were isolated from the roots of Xylopia vielana. Among these three new aporphine alkaloids, xylopialoid C (3) showed a special carbamido group directly connected to the nitrogen. The chemical structures of these nine compounds were determined by a combination of 1D and 2D NMR, MS, CD spectrum and Cu Kα X-ray crystallographic analyses. All these six alkaloids were firstly tested for the inhibitory activities against the production of NO in RAW264.7 cells stimulated by lipopolysaccharide (LPS). Among these compounds, 4 showed a potential inhibitory activity against the production of nitric oxide with IC50 value of 1.39 μM.