Isolation and Synthesis of an α-Malamic Acid Derivative from <i>Justicia ghiesbreghtiana</i>
作者:Lotfy D. Ismail、Peter Lorenz、Frank R. Stermitz
DOI:10.1021/np9801662
日期:1998.9.1
ghiesbreghtiana yielded N-(2-hydroxy-4,5-dimethoxyphenyl)-(S)-alpha-malamic acid, 1. Incomplete spectral analysis yielded a hypothetical structure, which was then proven by total synthesis. Coupling of the trifluoroacetate of malic anhydride (trifluoroacetoxysuccinic anhydride) with an arylamine provided the key to regiospecific preparation of the alpha- rather than beta-malamic acids.
Justicia ghiesbreghtiana的叶子的极性提取物产生N-(2-羟基-4,5-二甲氧基苯基)-(S)-α-苹果酸1。不完全的光谱分析产生了一种假设的结构,然后通过全合成对其进行了证明。苹果酸酐的三氟乙酸盐(三氟乙酰氧基琥珀酸酐)与芳基胺的偶联为α-苹果酸而不是β-苹果酸的区域特异性制备提供了关键。