非极性侧链的同手性α-氨基酸的肽可以形成一个1.8 8螺旋。在本文中,我们报道α氨氧基肽的构象研究1,2,3,已经官能化侧链,在这两种非极性和极性溶剂。1 H NMR,XRD和FTIR吸收研究证实了非极性溶剂以及甲醇中均存在八元环分子内氢键(N-O圈)。肽的CD研究1,2,3在不同的溶剂中,表明在甲醇和酸性水性缓冲液中保留了相当程度的螺旋含量。在α-氨氧基肽中引入功能化侧链为设计生物活性肽提供了机会。
revealed that the biased handedness of α N−O turn found in OAcc residue depends on its preceding chiral residue. It was then found that the helicalconformation was destroyed in the case of oligopeptides 6 and 7 [OAA-(OAcc)n, n = 2, 3]. The crystal structure of tripeptide 8 (iPrCO-d-OVal-OAcc-d-OVal-NHiBu) further disclosed the helicalstructure formed by three consecutive homochiral α N−O turns. This study
单体1从非手性的1-(氨氧基)环丙烷羧酸(OACC)和寡肽衍生的2 - 9由手性α氨氧基酸的和如OACC非手性α氨氧基酸的合成和它们的结构特征。八元环分子内氢键,即αN-O圈,在相邻残基之间形成,与它们的手性无关。但是,螺旋的形成是序列依赖性的。在N末端带有手性α-氨基酸(d -OAA)的二肽2和在C末端具有非手性OAcc的二肽优先采用右旋1.8 8螺旋结构,但是二肽3(OAcc- d-OAA)没有。理论计算结果与实验结果吻合良好,表明在OAcc残基中发现的αN-O转弯的偏向性取决于其先前的手性残基。然后发现在寡肽6和7 [OAA-(OAcc)n,n= 2,3]的情况下,螺旋构象被破坏。三肽8(i PrCO- d -OVal-OAcc - d -OVal-NH i的晶体结构Bu)进一步公开了由三个连续的同手性αN-O匝形成的螺旋结构。这项研究发现了非手性氨基氧酸残基(如OAcc单元)是一种
The First Solid-Phase Synthesis of Oligomeric α-Aminooxy Peptides
α-Aminooxy pentapeptides were synthesized on solid support by a stepwise monomer assembly in 40-65% purity of crude products, using the phthaloyl protected monomers.
Synthesis of Optically Active Phthaloyl <scp>d</scp>-Aminooxy Acids from <scp>l</scp>-Amino Acids or <scp>l</scp>-Hydroxy Acids as Building Blocks for the Preparation of Aminooxy Peptides