Synthesis of Poly-Aib Oligopeptides and Aib-Containing Peptides via the ‘Azirine/Oxazolone Method’, and Their Crystal Structures
作者:Ingeborg Dannecker-Dörig、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.201100116
日期:2011.6
protected poly‐Aib oligopeptides Z‐(Aib)n‐N(Me)Ph with n=2–6 were prepared according to the ‘azirine/oxazolone method’, i.e., by coupling amino or peptide acids with 2,2,N‐trimethyl‐N‐phenyl‐2H‐azirin‐3‐amine (1a) as an Aib synthon (Scheme 2). Following the same concept, the segments Z‐(Aib)3‐OH (9) and H‐L‐Pro‐(Aib)3‐N(Me)Ph (20) were synthesized, and their subsequent coupling with N,N′‐dicyclohexylcarbodiimide
受保护的聚-Aib寡肽Z-(Aib)n- N(Me)Ph的n = 2–6是根据“ azirine /恶唑酮法”制备的,即,通过将氨基酸或肽酸与2,2,N偶联-三甲基N-苯基2 H-茜素3-胺(1a)作为Aib合成子(方案2)。遵循相同的概念,合成了Z-(Aib)3 -OH(9)和H- L- Pro-(Aib)3 -N(Me)Ph(20)片段,并随后将它们与N,N '偶联-二环己基碳二亚胺(DCC)/ ZnCl 2导致受保护的七肽Z‐(Aib)3 ‐ L‐ Pro‐(Aib)3‐ N(Me)Ph(21 ;方案3)。通过X射线晶体学确定了Poly-Aib寡肽酰胺的晶体结构,从而确认了Aib肽的3 10螺旋构象。