作者:Kristian Strømgaard、Anders Bach
DOI:10.1055/s-0030-1258425
日期:2011.3
A synthetic route for replacing the central amino acid in the tripeptide Thr-Ala-Val (TAV) with a 1,3-substituted benzene ring was developed. l-Threonine was introduced into the benzene ring by a Grignard reaction with protected l-threoninal, where the nature of the side-chain protecting group was found to be of utmost importance. Subsequently, l-valine was introduced by a copper-mediated amination. Overall, the tripeptide analogue was obtained in six steps with an overall yield of 18%. An orthogonal protecting group strategy allowed attachment of the tripeptide analogue to a solid support and subsequent preparation of the corresponding pentapeptide analogue. Both compounds were tested in a plasma stability assay, showing improved stability compared to their peptide counterparts.
开发了一种合成路线,用于将三肽Thr-Ala-Val(TAV)中的中心氨基酸替换为1,3-取代的苯环。通过与保护的L-苏氨酸醛的格氏反应,将L-苏氨酸引入苯环,发现侧链保护基团的性质至关重要。随后,通过铜介导的胺化引入L-缬氨酸。总体上,获得三肽类似物需要六步反应,总产率为18%。正交保护基团策略使得能够将三肽类似物连接到固体支持物上,并随后制备相应的五肽类似物。这两种化合物都在血浆稳定性测定中进行了测试,显示出比相应的多肽更高的稳定性。