Synthesis of chiral urethane N-alkoxycarbonyl tetramic acids from urethane N-carboxyanhydrides (UNCAs)
作者:Jean-Alain Fehrentz、Elisabeth Bourdel、Jean-Christophe Califano、Olivier Chaloin、Chantal Devin、Patrick Garrouste、Ana-Christina Lima-Leite、Muriel Llinares、François Rieunier、Jean Vizavonna、François Winternitz、Albert Loffet、Jean Martinez
DOI:10.1016/s0040-4039(00)76757-8
日期:1994.3
The synthesis of chiral N-protected tetramic acid derivatives which are important precursors of β-hydroxy γ-amino acid under mild conditions is described. Reaction of urethane-N-carboxyanhydrides (UNCAs) with Meldrum's acid in the presence of a tertiary amine, followed by subsequent cyclisation produced tetramic acid derivatives. This procedure is applicable to Boc-, Fmoc- and Z- N-carboxyanhydrides
描述了在温和条件下手性N-保护的四酸衍生物的合成,该衍生物是β-羟基γ-氨基酸的重要前体。在叔胺存在下,氨基甲酸酯-N-羧基酐(UNCA)与Meldrum酸反应,然后环化生成四甲酸衍生物。此程序适用于Boc-,Fmoc-和Z- N-羧基酸酐。