Enantiopure Trifluoromethylated β<sup>3,3</sup>-Amino Acids: Synthesis by Asymmetric Reformatsky Reaction with Stable Analogues of Trifluoromethyl <i>N</i>-<i>tert</i>-Butanesulfinylketoimines and Incorporation into α/β-Peptides
作者:Fabienne Grellepois
DOI:10.1021/jo302549v
日期:2013.2.1
Addition of a Reformatsky reagent to alpha-aryl(alkyl) alpha-trifluoromethyl N-tert-butanesulfinyl hemiaminals, bench-stable surrogates of trifluoromethyl ketoimines, provided beta-alkyl(aryl) beta-trifluoromethyl beta-amino acids derivatives in good yields and high diastereoselectivities. The N-tert-butanesulfinyl beta(3,3)-amino esters were further utilized as versatile intermediates for the elaboration of heterodi- and -tripeptides.
Enantiopure β3-Trifluoromethyl-β3-homoalanine Derivatives: Coupling with Boc-Protected Amino Acids and Conformational Studies of Peptides in Solid State
作者:Fabienne Grellepois、Nathalie Saraiva Rosa
DOI:10.1055/s-0041-1737396
日期:2022.7
conformation of the peptide. Herein, we describe a short, scalable and robust method to synthesize N- and/or C-protected enantiopure (R)- and (S)-β3-trifluoromethyl-β3-methyl β-amino acidderivatives and liquid-phase coupling methods suitable for incorporation of Boc-protected aminoacids into short α/β- and β-peptides. Conformational studies of some of these original peptides via X-ray diffraction analysis
使用对映体纯β 3 -三氟甲基-β 3 -烷基β-氨基酸来设计肽将有助于显着提高肽在体内的稳定性。此外,与氮官能团相邻的四取代碳上的取代基产生的空间位阻与三氟甲基的吸电子效应相结合,更可能影响肽的3D构象。在此,我们描述了一种合成N-和/或C-保护的对映体纯 ( R )- 和 ( S )-β 3 -三氟甲基-β 3的简短、可扩展且稳健的方法-甲基 β-氨基酸衍生物和适合将 Boc 保护的氨基酸掺入短 α/β-和 β-肽的液相偶联方法。通过 X 射线衍射分析对这些原始肽中的一些肽进行的构象研究突出了三氟甲基化氨基酸内的残基内 C6 氢键。