<i>N</i><i><sub>i</sub></i>-to-<i>N</i><i><sub>i</sub></i> <sub>+ 3</sub>-Ethylene-Bridged Partially Modified Retro-Inverso Tetrapeptide β-Turn Mimetic: Design, Synthesis, and Structural Characterization
作者:Yinglin Han、Craig Giragossian、Dale F. Mierke、Michael Chorev
DOI:10.1021/jo011041w
日期:2002.7.1
A 10-membered heterocyclic ring system 1,3,8-trisubstituted 2,5,7-trioxo-1,4,8-triazadecane that represents a Ni-to-Ni+ 3-ethylene-bridged partially modified retro-inverso tetrapeptide beta-turn mimetic (EBRIT-BTM) has been designed, synthesized, and structurally analyzed. These compounds utilize an ethylene bridge to replace the COi...HNi + 3 10-membered hydrogen bond of standard beta-turns. The N
10元杂环系统1,3,8-三取代的2,5,7-trioxo-1,4,8-三氮杂十八烷,代表Ni-to-Ni + 3-乙烯桥联的部分修饰的逆反四肽β-模拟转弯器(EBRIT-BTM)已经过设计,合成和结构分析。这些化合物利用乙烯桥取代标准β-转角的COi ... HNi + 3个10元氢键。通过用N-(9-芴基甲氧基羰基),N-(2-甲酰基甲基)-甘氨酸酯的叔丁基对苯丙氨酰胺进行还原烷基化,以90%的产率获得N,N′-亚乙基桥连的二聚体。正交保护策略和HATU介导的偶联允许逐步逐步添加单体结构单元,从而生成N(i)-N(i + 3)-乙烯桥联的线性前体:进一步加工线性前体,分别以44%和39%的产率产生了乙烯桥联的模型化合物(16)和(18)(g,gem-二氨基烷基; m,丙二酰基;和r,方向相反的氨基酸残基)。两种EBRIT-BTM化合物的结构特征是使用1H NMR和大量计算机模拟确定的。