HOVETRICHOSIDES C-G, 5 NEW GLYCOSIDES OF 2 AURONOLS, 2 NEOLIGNANS, AND A PHENYLPROPANOID FROM THE BARK OF HOVENIA-TRICHOCAREA

Two 2-hydroxy-2-benzlcoumaranone glycosides, 2,4,6-trihydroxy-2-[(4'-h ydroxyphenyl) l]-3(2H)-benzofuranone-4-yl-beta-D-glucopyranoside (maes opsin 4-O-glucoside) (1) and 2,4,6-trihydroxy-2-[(4'-hydroxyphenyl) a- D-glucopyranosido-4'-yl-alpha-L-rhamnopyranoside (maesopsin 4-O-glucos ido 4'-O-rhamnoside) (2), two neolignan glycosides, -2,3-dihydro-2-(4' -hydroxy-3'-methoxylphenyl)-5-(3 ''-hydroxy-1 -3-benzofuranmethanol-4' -yl-beta-D-glucopyranosyl- a-D-glucopyranosyl-(1-->2)]-beta-D-glucopyr anoside (3) and(threo) 1-(4'-hydroxy-3'-methoxy)-2-(4 ''-hydroxymethyl -2 '',6 ''-dimethoxyphenoxy)- propane-1,3-diol-4'-yl-beta-D-glucopynos ide (4), and a phenylpropanoid glycoside, eta-D-apiofuranosyl-(1-->6)- beta-D-glucopyranoside (5) were isolated from the bark of Hovenia tric hocarea. Compounds 1-5 were named hovetricosides C-G, respectively, an d their structures were established by extensive NMR experiments and c hemical methods. Also obtained in this investigation were the known co mpounds acanthoside B, kelampayoside A, shashenoside I, and eta-D-xylo pyranosyl-(1-->6)beta-D-glucopyranoside.