2-Oxopiperazine-Based γ-Turn Conformationally Constrained Peptides: Synthesis of CCK-4 Analogues
作者:Susana Herrero、M. Teresa García-López、Miriam Latorre、Edurne Cenarruzabeitia、Joaquín Del Río、Rosario Herranz
DOI:10.1021/jo0256336
日期:2002.5.1
gamma-turn conformationally constrained tripeptides. The synthetic pathway devised for the preparation of both epimers of 1 at C(5) involves a reductive amination of cyanomethyleneamino pseudopeptides with amino acid derivatives, followed by regiospecific lactamization of the resulting C-backbone branched pseudopeptides. The versatility of this methodology is illustrated in the synthesis of analogues of the
2-氧代哌嗪衍生物1已被设计为γ-转构象约束的三肽的模拟物。为在C(5)上制备两个差向异构体而设计的合成途径涉及用氨基酸衍生物对氰基亚甲基氨基假肽进行还原胺化,然后对所得C-骨架支链假肽进行区域特异性内酰胺化。四肽Boc- [Nle(31)]-CCK-4和Boc- [Lys(邻甲苯基氨基羰基)(31)]-CCK-4的类似物的合成说明了该方法的多功能性。在这些Boc-CCK-4类似物中引入新的构象限制,导致对CCK受体的亲和力损失2或3个数量级。这些结果表明CCK-4 C端三肽的生物活性构象中没有伽马转。