1H-Azepine-4-amino-4-carboxylic Acid: A New α,α-Disubstituted Ornithine Analogue Capable of Inducing Helix Conformations in Short Ala-Aib Pentapeptides
作者:Sara Pellegrino、Alessandro Contini、Francesca Clerici、Alessandro Gori、Donatella Nava、Maria Luisa Gelmi
DOI:10.1002/chem.201104023
日期:2012.7.9
1H‐azepine‐4‐amino‐4‐carboxylic acid, abbreviated as Azn, a conformationally restricted analogue of ornithine, was realized. It was obtained on a gram scale in good overall yield in five steps, three of which did not require isolation of the intermediates, starting from the readily available 1‐amino‐4‐oxo‐cyclohexane‐4‐carboxylic acid. Both enantiomers were used for the preparation of pentapeptide models containing
实现了非常有效的正交保护的1 H-氮杂-4-氨基-4-羧酸的合成,缩写为鸟氨酸的构象受限类似物Azn。它以克为单位,从五个步骤中以较高的总收率获得,其中三个步骤不需要分离中间体,从容易获得的1-氨基-4-氧代-环己烷-4-羧酸开始。两种对映异构体均用于制备含有Ala,Aib和Azn的五肽模型。使用光谱技术(NMR,CD)和分子动力学对5型聚体肽进行的构象研究表明(R)-Azn异构体具有显着的成螺旋作用。