6-O-α-L-(2''-O- AND 3''-O-ISOFERULOYL)RHAMNOPYRANOSYLCATALPOLS FROM PREMNA JAPONICA

Article abstract of DOI:10.1016/0031-9422(89)80282-1

From the methanol extract of the leaves of Premna japonica, two new monoacyl 6-O-α-L-rhamnopyranosylcatalpols were isolated.The structures of these compounds were determined to be 6-O-α-L-(2''-O-isoferuloyl and 3''-O-isoferuloyl)rhamnopyranosylcatalpols by NMR spectroscopy and chemical conversions.Key Word Index - Premna japonica; Verbenaceae; iridoid; 6-O-α-L-(rhamnopyranosylcatalpol; 6-O-α-L-(2''-O-isoferuloyl) rhamnopyranosylcatalpol; 6-O-α-L-(3''-O-isoferuloyl) rhamnopyranosylcatalpol.