Design, synthesis, and conformational analysis of eight-membered cyclic peptidomimetics prepared using ring closing metathesis
作者:Christopher J. Creighton、Gregory C. Leo、Yanming Du、Allen B. Reitz
DOI:10.1016/j.bmc.2004.06.015
日期:2004.8
pendent amide chains. The corresponding saturated derivatives (7-amino-8-oxoazocane-2-carboxylic acid) were also synthesized and investigated. The 2S,7S azocane bears an extended geometry and mimics the C(+) conformer of ox-[Cys-Cys], found in a variety of naturally occurring peptides. The scaffolds described here are useful for the design of constrained peptidomimics with defined secondary structure
作为鉴定在掺入肽时采用确定的二级结构的新型支架的程序的一部分,我们设计和制备了基于7-氨基-8-氧代-1,2,3,6的约束八元环内酰胺文库,7-五氢偶氮辛-2-羧酸。闭环复分解(RCM)被用作关键步骤,以高收率进行生产,得到Z烯烃。在此反应顺序中,第一代亚苄基钌RCM催化剂优于第二代咪唑啉催化剂,后者在较高浓度下可进行广泛的低聚反应。2S,7S和2R,7S立体异构体的构象分析表明,该2R,7S异构体在固体(X射线晶体结构)和水中(NMR分析)为VIa型β-转角。VIa型的Beta转向比较少见,通常带有在含有脯氨酸的序列中发现的顺酰胺键。2S,7S非对映异构体具有延伸的侧链酰胺链几何形状。还合成并研究了相应的饱和衍生物(7-氨基-8-恶唑烷-2-羧酸)。2S,7S偶氮烷具有扩展的几何形状,并模仿在多种天然存在的肽中发现的ox- [Cys-Cys]的C(+)构象异构体。本文所述的支架可用于设计