Synthesis of condensed tannins. Part 6. The sequence of units, coupling positions and absolute configuration of the first linear [4,6 : 4,6]-triflavanoid with terminal 3,4-diol function
作者:Phillip M. Viviers、Desmond A. Young、Jacobus J. Botha、Daneel Ferreira、David G. Roux、William E. Hull
DOI:10.1039/p19820000535
日期:——
The first linear triflavanoid with a terminal 3,4-diol function, (2R,3S,4S : 2′R,3′S,4′R : 2″R,3″S,4″R)-[4,6 : 4,6]-bi-[(–)-fisetinidol]-(+)-mollisacacidin, is associated with a set of four diastereoisomeric biflavanoid homologues, [4,6]-(–)-fisetinidol-(+)-mollisacacidins, in the heartwood of the black wattle tree, Acacia mearnsii. The sequence of units in the triflavanoid and its bonding points have
与终端-3,4-二醇功能的第一线性triflavanoid,(2 - [R,3小号,4小号:2' - [R,3'小号,4' - [R:2“ - [R,3”小号,4“ - [R )- [ 4,6:4,6]-双-[(-)-菲塞蒂尼多]-(+)-molacsacacidin与一组四个非对映异构双黄烷类同系物[4,6]-(-)-菲塞尼多-(+ )molacsacacidins,在黑荆树心木中的相思树(Acacia mearnsii)中。使用自旋解耦技术在500 MHz处通过nmr光谱测定了三黄酮类化合物中的单元序列及其键合点。三类黄酮和两个(2 R,3 S,4小号)-2,3-反式-3,4-顺-configurations在他们的“上”单元,从结果体外它们的推定的前体的自缩合(2 - [R,3小号,4 - [R)-flavan- 3,3',4,4',7-戊醇[(+)-mollisacacidin],因此可以定义它们各自的绝对构型。