A Reinvestigation of the Oxidative Rearrangement of Yohimbane-Type Alkaloids. Part A. Formation of pseudoindoxyl ( = 1,2-dihydro-3H-indol-3-one) derivatives
作者:Reto Stahl、Hans-J�rg Borschberg
DOI:10.1002/hlca.19940770514
日期:1994.8.10
Contrary to earlier reports, the base-induced rearrangement of the 7-hydroxy-7H-indolenines derived from ajmalicine (1), yohimbine (5), corynanthine (6), methyl reserpate (16), and methyl isoreserpate (17) in each case furnished not just one, but two epimeric spiro-pseudoindoxyl derivatives which have opposite configuration at the spiro centre C(2). In all cases, the major component was shown by NOE
与先前的报道相反,来自阿马利辛(1),育亨宾(5),哥丹宁(6),草皮酸甲酯(16)和异二十烷酸甲酯(17)的7-羟基-7 H-吲哚碱的碱基诱导重排。每个案例不仅提供了一个,而且还提供了两个在螺旋中心C(2)具有相反构型的差向异构螺-伪吲哚酚衍生物。在所有情况下,NOE实验均显示其主要成分为A型异构体(羰基位于环C和D定义的平面下方)。热力学不太稳定的乙型pseudoindoxyl差向异构体4,10,12,和22 首次被分离和鉴定。