Phenolic Compounds from the Leaves of Castanopsis fargesii.

In the course of a phytochemical and chemotaxonomical investigation of Castanopsis species (Fagaceae), three new phenolic compounds, (3 R ,1' S )-[1'-(6″- O -galloyl-β-d-gluco-pyranosyl)oxyethyl]-3-hydroxy-dihydrofuran-2(3 H )-one ( 1 ), (2 R ,3 S )-2-[2'-(galloyl)oxyethyl]-dihydroxybutanoic acid ( 2 ), and (3 S ,4 S )-3-hydroxymethyl-3,4-dihydro-5,6,7-trihydroxy-4-(4'-hydroxy-3'-methoxyphenyl)-1 H -[2]-benzopyran-1-one ( 3 ) were isolated from the fresh leaves of Castanopsis fargesii . In addition, a known phenolic glycoside, gentisic acid 5- O -α-l-rhamnopyranosyl-(1→2)-β-d-glucopyranoside ( 4 ) was also isolated and identified. Their structures were elucidated by means of spectroscopic methods including one- and two-dimensional NMR techniques.