Proton NMR configurational correlation for retro-inverso dipeptides: application to the determination of the absolute configuration of "enkephalinase" inhibitors. Relationships between stereochemistry and enzyme recognition
作者:M. C. Fournie-Zaluski、E. Lucas-Soroca、J. Devin、B. P. Roques
DOI:10.1021/jm00155a027
日期:1986.5
A stereospecific synthesis of thiorphan [N-[2(RS)-(mercaptomethyl)-1-oxo-3-phenylpropyl]glycine] and retro-thiorphan [3-[[1(RS)-(mercaptomethyl)-2-phenylethyl]amino]-3-oxopropanoic acid], two highly potent inhibitors of enkephalinase, a neutral endopeptidase involved in enkephalin metabolism, is reported. Due to a rapid isomerization process, derivatives of retro-thiorphan, which contains a 2-substituted
噻吩[N- [2(RS)-(巯基甲基)-1-氧代-3-苯基丙基]甘氨酸]和噻吩基反[3-[[1(RS)-(巯基甲基)-2-苯基乙基]的立体定向合成。据报道,有两种高效的脑啡肽酶抑制剂,即一种参与脑啡肽代谢的中性内肽酶,即氨基] -3-氧代丙酸]。由于快速的异构化过程,不能通过经典方法分离包含2-取代的丙二酰基部分的反式-硫烷的衍生物。然而,通过HPLC实现了这些逆硫代硫烷衍生物的非对映异构体混合物的分离。通过使用NMR构型相关性确定每种异构体的绝对构型。各种抑制剂的抑制能力表明,在硫醇系列中,对脑啡肽酶的亲和力与2-(巯基甲基)-1-氧代-3-苯基丙基部分的立体化学无关。相反,在逆硫氰酸系列中,观察到两种对映体的抑制活性相差100倍。这表明在酶的活性位点上,这两种抑制剂的构象行为存在很大差异。