LIGNANS FROM ARISTOLOCHIA BIROSTRIS

Article abstract of DOI:10.1016/0031-9422(90)89045-B

The investigation of a specimen of Aristolochia birostris afforded, in adition to β-sitosterol, seven lignoids: rel-(8R)-Δ^8'-3,4-methylenedioxy-5,3',5'-trimethoxy, rel-(8R)-Δ^8'-3,4-methylenedioxy-3',5'-dimethoxy-, rel-(8R)-Δ^8'-3,3',4,5,5'-pentamethoxy- and rel-(7R,8R)-Δ^8'-3,4-methylenedioxy-3,5,5'-trimethoxy-7-hydroxy-8.0.4'-neolignan; rel-(8R,8'R)-3,4;3',4'-dimethylenedioxy-9-oxo-, rel(8R,8'R)-3,4;3',4'-dimethylenedioxy-9β-hydroxy- and rel-(8R,8'R)-3,4;3',4'-dimethylenedioxy-9α-hydroxy-8.8',9.0.9'-lignan and rel-(7S,8S,7'R,8'R)-3,3',4,4',5,5'-hexamethoxy-7.0.7',8,8'-lignan.The structures were elucidated by spectroscopic anaysis.