Chemical constituents of the stems of Piper ribesoides Wall

Abstract

The dried stems of Piper ribsoides Wall. Were extracted by organic solvents. The crude extracts were separated by flash column chromatography and 7 compounds were obtained. From their physical properties and spectroscopic data. These 7 compounds were identified as a methy 1-5 (3’,4’ – methylenedioxyphenyl) penta-2,4-dienoate (m.p. 141 - 143°C , C13H12O4, yellow needle), 2-(3’-hydroxy-4’-methoxyphenyl)-3methyl-5-trans-propenyl-7-methoxybenzofuran (m.p. 102-105°C, C20H20O4, white solid), 2- (3’,4’-methylenedioxphenyl)-3-methyl-5-trans-propennyl-7-methoxybenzofuran (m.p. 146-148°C, C20H18O4, white needle) , (-)-borneol p-hydroxycinnamide (m.p. 153 - 154°C, C19H24O3, white needle) , heteropeucenin-8-methyether (m.p. 105-107°C C16H18O4, yellow needle) , crotepoxide (m.p. 149 -150°C , C18H18O8, white solid) และ N-isobuty-13-(3,4-methylenedioxypheny)trideca -2,4,12 – trinamide (m.p. 116 - 117°C, C24H33NO3, white needle)