A new C-methylated homoisoflavanone and triterpenoid from the rhizomes of Polygonatum 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-3beta,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.