Flavonol galactoside caffeiate ester and homoisoflavones from Caesalpinia millettii HOOK. et ARN

Abstract

Chemical examination of the stems of Caesalpinia millettii HOOK. et ARN led to the isolation of new flavonol glycoside caffeiate ester (1) and homoisoflavone (2), along with four known homoisoflavones: eucomin (3), bonducellin (4), 8-methoxybonducellin (5) and intricatinol (6). The structures of 1 and 2 were established to be tamarixetin 3-O-(6″-O-E-caffeoyl)- β-D-galactopyranoside (1) and (Z)-7-hydroxy-8-methoxy-3-(4-methoxybenzyl) chroman-4-one (2) on the basis of detailed analyses of physical, chemical, and spectral data. Compounds 3-6 were isolated from this plant for the first time. © 2007 Pharmaceutical Society of Japan.