[Two new phenylethanoid glycosides from Corallodiscus flabellata]

To study the chemical constituents from Corallodiscus flabellata.

Fresh plant of Corallodiscus flabellata was extracted twice with boiling water, filtered to remove insoluble materials, concentrated under reduced pressure at temperature 55 degrees C to a small volume. The concentrated liquor was subjected to solvent-solvent partitioning using ether, ethyl acetate, and n-butanol (saturated with water). The fraction of ethyl acetate extract was chromatographed over macroporous adsorption resin (Diaion HP-20) eluted with a mixture of H2O and MeOH in increasing MeOH content. Their fractions from resin were repeatedly chromatographed over Sephadex LH-20, Toyopearl HW-40, gel MCI, Gel CHP-20 and silica gel column. Structures of compounds obtained were identified on the basis of their spectral data, hydrolysis and chemical correlation.

Two phenylethanoid glycosides (I, II) and three phenolic acids were obtained from the EtOAc fraction of water-extracts. Their structures were identified as 3,4-dihydroxyphenylethanol-8-O-[beta-D-apiofuranosyl (1-->2)]-beta-D-glucopyranoside (I), 3,4-dihydroxyphenylethanol-8-O-[(5-O- Vanilloyl)-beta-D-apiofuranosyl(1-->2)]-beta-D-glucopyranoside (II), vanillic acid (III), syringic acid (IV) and ferulic acid (V).

I and II are new compounds. Compounds III, IV and V were isolated from this plant for the first time.