Dalbergia species. Part IX. Phytochemical examination of Dalbergia stevensonii standl

Abstract

The bark and heartwood of Dalbergia stevensonii have yielded twenty-three natural products of which one, stevenin, is a new neoflavanoid [6-hydroxy-4-(3-hydroxyphenyl)-7-methoxycoumarin], and two are new racemic isoflavanones. The structures of the extractives have been examined by physical methods and in addition the new compounds have been synthesised. The oxygenation pattern relating the structures of isoflavones, isoflavanones, pterocarpans, and coumestones suggests a common biosynthetic origin.