Constituents of Eupomatia Species. 3. New Eupomatenoid Lignans From the Leaves and Wood of Eupomatia laurina

Abstract

The leaves of Eupomatia laurina R.Br. gave seven substances previously isolated from the bark together with a flavone identified as 3,7,3?- trimethylquercitin, and the new lignans, eupomatenoid-9 and -10, which were shown to be erythro-5-(1?,2?-dihydroxypropyl)-2-(4?-hydroxy-3?- methoxyphenyl)-3-methylbenzofuran and 2-(4?-hydroxy-3?-methoxyphenyl)-3-methylbenzofuran-5-carbaldehyde, respectively. ��� The wood yielded seven substances which also occur in the bark, together with eupomatenoid-11 and -12, and eupodienone-2 and -3. Eupomatenoid-11 was found to be (R)-5-(2?-hydroxypropyl)-2-(3?,4?- methylenedioxyphenyl)-3-methylbenzofuran and eupomatenoid-12 to be the methyl ether of eupomatenoid-7.