Cyclopropane-Derived Peptidomimetics. Design, Synthesis, and Evaluation of Novel Ras Farnesyltransferase Inhibitors
作者:Michael C. Hillier、James P. Davidson、Stephen F. Martin
DOI:10.1021/jo001257i
日期:2001.3.1
Trisubstituted cyclopropanes have previously been established as rigid replacements of dipeptide arrays in several biological systems. Toward further evaluating the utility of these dipeptide mimics in the design of novel CA(1)A(2)X-based inhibitors of Ras farnesyltransferase (FTase), the conformationally constrained, diastereomeric pseudopeptides CAbuPsi[COcpCO]FM 7-9, the flexible analogue CAbuPsi[CHOHCH(2)]FM
先前已经建立了三取代的环丙烷作为几种生物系统中二肽阵列的刚性替代品。为了进一步评估这些二肽模拟物在基于Ras farnesyltransferase(FTase)的新型CA(1)A(2)X-基抑制剂的设计中的实用性,该抑制剂是构象受限的非对映体假肽CAbuPsi [COcpCO] FM 7-9,制备类似的CAbuPsi [CHOHCH(2)] FM(10)和四肽CAbuFM(6)。特别设计了两个肽主链取代基和7-9中环丙烷环上的苯基的方向,以探测FTase A(2)子位点疏水结合口袋的选定拓扑特征。必要的三取代环丙烷羧酸22和非对映体环丙基内酯32a的合成,b特色为手性烯丙基重氮乙酸酯的非对映选择性分子内环丙烷化,以及通过用有机铜酸盐打开N-Boc-氮丙啶,将侧链引入环丙烷衍生的二肽取代的C端氨基酸的新方法。然后通过标准肽偶联技术将这些环丙烷中间体转化为靶向的FTase抑制剂7-9。发现伪肽7-9是Ras