Phenylpropanoid Esters of Rhamnose from Buddleja asiatica

Four new phenylpropanoid esters of rhamnose, asiatisides A-D, along with the known compounds, buergeriside C(1) (5), p-methoxycinnamic acid, ferulic acid, and O-methylferulic acid were obtained from the aerial parts of Buddleja asiatica LOUR by chromatographic methods. The new compounds were elucidated as 3-O-acetyl-4-O-(p-methoxycinnamoyl)-alpha-L-rhamnopyranose (1), 3-O-acetyl-4-O-feruloyl-alpha-L-rhamnopyranose (2), 2-O-acetyl-4-O-(O-methylferuloyl)-alpha-L-rhamnopyranose (3), 2-O-acetyl-4-O-(p-methoxycinnamoyl)-alpha-L-rhamnopyranose (4) by spectral data (1D-, 2D-NMR, and MS), respectively.