Enantiopure Cα-tetrasubstituted α-amino acids. Chemo-enzymatic synthesis and application to turn-forming peptides
作者:Bernard Kaptein、Quirinus B Broxterman、Hans E Schoemaker、Floris P.J.T Rutjes、Johan J.N Veerman、Johan Kamphuis、Cristina Peggion、Fernando Formaggio、Claudio Toniolo
DOI:10.1016/s0040-4020(01)00548-8
日期:2001.7
By a chemo-enzymatic approach we carried out a large-scale synthesis of four enantiopure, sterically constrained, C-alpha-tetra-substituted alpha -amino acids, all characterized by a sidechain (CCdelta)-C-gamma double bond. By using one of them (L-Mag), we prepared an N-alpha-protected tetrapeptide benzylamide which was shown to adopt a beta -turn conformation and to efficiently undergo ring-closing olefin metathesis. (C) 2001 Elsevier Science Led. All rights reserved.
Mag: a Cα-Methylated, Side-chain Unsaturated α-Amino Acid. Introduction into Model Peptides and Conformational Preference
Cα-methylated α-aminoacid Mag, characterized by a side-chain CγCδ bond. We also prepared a series of model peptides containing Mag in combination with Aib and Ala. All of the peptides were fully characterized and their conformational preference was determined in solution by FT-IR absorption and 1H NMR investigations. X-Ray diffraction analyses of l-Mag, a derivative and three peptides are also presented
通过化学-酶促的方法,我们合成中的手性,C α甲基化的α氨基酸MAG,其特征在于,一个侧链C γ C δ键。我们还制备了一系列含有Mag以及Aib和Ala的模型肽,并对所有肽进行了充分表征,并通过FT-IR吸收和1 H NMR研究了它们在溶液中的构象偏好。还介绍了l-Mag,一种衍生物和三种肽的X射线衍射分析。我们发现,该C α甲基化的α氨基酸是优良的β转角和3 10螺旋前者。完整旋转3 10后,带有两个Mag残基的肽一个在另一个的顶部-螺旋已经合成并表征。