The Isolation of New Pyrano-2-arylbenzofuran Derivatives from the Root of Glycyrrhiza glabra

抄録

Two new pyrano-2-arylbenzofuran derivatives named glabrocoumarones A and B were isolated from commercially available licorice of Glycyrrhiza glabra origin, and thier structures were elucidated as 4'-6-dihydroxy-[6", 6"-dimethylpyrano(2", 3" : 2', 3')]-2-arylbenzofuran and 2', 6-dihydroxy-[6", 6"-dimethylpyrano(2", 3" : 4', 3')]-2-aryl-benzofuran, respectively, on the basis of spectroscopic evidence. Six known compounds were also obtained and identified spectroscopically as glabrol, 3-hydroxygrabrol, shinflavanone, [6", 6"-dimethylpyrano(2", 3" : 7, 8)]-[6''', 6'''-dimethylpyrano(2''', 3''' : 4', 3')]-flavanone (xambioona), 3, 3'-di-γ, γ-dimethylallyl-2'-4, 4'-trihydroxychalcone and [6", 6"-dimethylpyrano(2", 3" : 4, 5)]-3'-γ, γ-dimethylallyl-2', 3, 4'-trihydroxychalcone.