α-Glucosidase inhibitory constituents from Cuscuta reflexa

T,Ao new compounds, 7'-(3',4'-dihydroxyphenyl)-N-[(4- methoxyphenyl)ethyl[propenamide (4). and 7'-(4'-hydroxy-3'-methoxphenyl)-N-[(4-butylphenyl)ethyl]propenamide (5) ha c been isolated from Cuscuta reflexa along with five known compounds, 6,7-dimethox,-2H-1-benzopran-2-one (1), 3-(3,4-dihydroxyphenyl)-2-propen-1-ethanoate(2),6,7,8-trimethoxy-2H-1-benzopran-2-one(3),3-(4-O-beta -D-glucopranosie-3,5-dimetlioxyphenyl)2-propen-1-ol (6), 2-(3-hydroxy-4-methoxyphenl)-3,5-dihydroxy-7-O-beta -D-glucopranoside-4H-benzopyrane-4-one (7), reported for the first time from this species. Structures of these compounds were determined by spectral analysis. These compounds showed strong inhibitory activity against a-glucosidase.