Synthesis and conformational analysis of a type VIb β-turn mimetic based on an eight-membered lactam
作者:Sam Derrer、John E. Davies、Andrew B. Holmes
DOI:10.1039/b003791p
日期:——
As part of a programme evaluating medium-ring lactams as peptide conformational constraints the trans-disubstituted lactam dipeptide (3S,8R)-3-acetylamino-8-methoxycarbamoylazocan-2-one (3) was selected as a template to mimic the type VI β-turn conformation of natural polypeptides. The enantioselective synthesis of the eight-membered lactam 3 is discussed. The X-ray crystal structure of the methyl
作为评估中环的计划的一部分 内酰胺类 作为 肽构象约束反式二取代内酰胺选择二肽(3S,8R)-3-乙酰氨基-8-甲氧基氨基甲酰基偶氮烷-2-one(3)作为模板来模拟天然的VI型β-转角构象多肽。八元对映体的合成内酰胺 讨论图3。3的甲酯前体的X射线晶体结构显示出经典的VIbβ-转角构象。广泛的1 H NMR 的光谱学研究 二肽 3英寸极性溶剂提供了VI型β-转弯的证据。分析显示两个折叠构象的平衡。