An efficient and general synthesis of bibenzyl derivatives bearing pyranyl rings was achieved by ethylenediamine diacetate-catalyzed reactions of 3,5-dihydroxybibenzyl with $\alpha},\beta}$-unsaturated aldehydes in moderate yields. These reactions provided naturally occurring compounds 1 and 2 in single step reaction. As an application of this methodology, biologically interesting natural bauhinol D (8) was synthesized by a convergent sequence from readily available benzaldehyde and benzyl phosphonate.
通过
乙二胺二
醋酸盐催化3,5-二羟基双
苯乙烯与α,β-不饱和醛的反应,成功实现了一种高效且通用的合成含
吡喃环的双
苯乙烯衍
生物的方法,产率适中。这些反应在一步反应中提供了天然化合物1和2。作为该方法的应用,
生物学上有趣的天然物质建筑块D(8)通过从易于获得的
苯甲醛和
苯基膦酸酯的收敛序列合成。