A new C-methylated homoisoflavanone and triterpenoid from the rhizomes ofPolygonatum odoratum

Abstract A new C-methylated homoisoflavanone together with four known rare methyl-homoisoflavanones and one known 9,19-cyclolart triterpenoid were isolated and characterised from the rhizomes of Polygonatum odoratum. The structure of the new compound was determined as 3-(4′-methoxy-benzyl)-5,7-dihydroxy-6-methyl-8-methoxy-chroman-4-one (1). The four known methyl-homoisoflavanones were determined as 3-(4′-methoxy-benzyl)-5,7-dihydroxy-6,8-dimethyl-chroman-4-one (2), 3-(4′-hydroxy-benzyl)-5,7-dihydroxy-6,8-dimethyl-chroman-4-one (3), 3-(4′-hydroxy-benzyl)-5,7-dihydroxy-6-methyl-8-methoxy-chroman-4-one (4) and 3-(4′-hydroxy-benzyl)-5,7-dihydroxy-6-methyl-chroman-4-one (5). The one 9,19-cyclolart triterpenoid was determined as 9,19-cyclolart-25-en-3β,24 (R)-diol (6). Compound 2, 5, 6 were isolated for the first time from the Polygonatum genus. The compounds (1,3–6) were found to be strong against the growth of bacteria and plant pathogenic fungi. Keywords: Polygonatum odoratum homoisoflavanonesmethylodoratumanone Atriterpenoid Acknowledgements We wish to acknowledge the financial support from the National Natural Science Foundation of China (No. 30671672) and the Program for Youth Bakebone Talents and the Program for Youth Foundation of Northwest A & F University (07ZR013).