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 regiospecificpreparation of the alpha- rather than beta-malamic acids.