Synthetic strategy for bicyclic tetrapeptides HDAC inhibitors using ring closing metathesis
作者:MD NURUL ISLAM、MD SHAHIDUL ISLAM、MD ASHRAFUL HOQUE、TAMAKI KATO、NORIKAZU NISHINO
DOI:10.1007/s12039-015-0922-y
日期:2015.9
and biochemical stability. We have developed bicyclic tetrapeptide HDAC inhibitors based on different cyclic tetrapeptide scaffolds. For the synthesis of these bicyclic tetrapeptides, two cyclization steps, namely, peptide cyclization and fusion of aliphatic side chains by ring closing metathesis (RCM) were involved. In the course of these syntheses, we have established two facts: a lower limit of aliphatic
环肽具有多种生物活性,由于结构刚性,受体选择性和生化稳定性而被认为是良好的治疗剂。我们已经基于不同的环四肽支架开发了双环四肽HDAC抑制剂。为了合成这些双环四肽,涉及两个环化步骤,即肽环化和通过闭环复分解(RCM)融合脂族侧链。在这些合成过程中,我们已经建立了两个事实:脂族环长度的下限和双环四肽合成的较好合成路线。发现九个亚甲基环长度是脂族环的下限,并且合成路线的选择取决于环状四肽支架中氨基酸的构型。 九个亚甲基单元是脂肪族环长度的下限,合成途径的选择取决于环状四肽支架中氨基酸的构型。RCM和随后的肽环化是LDLD配置的正确途径,而LLLD配置的反向途径是正确的途径。