Synthesis, reactivity and conformational preferences of novel enediynyl peptides: a possible scaffold for β-sheet capping turns
作者:Amit Basak、Kakali Rani Rudra、Subhendu Sekhar Bag、Ajoy Basak
DOI:10.1039/b202660k
日期:——
Novel enediynyl tripeptides 2(aâc) in fully protected forms have been prepared via a sequence of palladium(0)-based Sonogashira coupling. The thermal reactivity of these peptides was shown to be dependent upon the nature of the side chain in the amino acids. Analysis of the CD-spectra of these peptides as well as the variation of chemical shifts with temperature revealed the presence of a β-sheet nucleating conformation in equilibrium with a conformation induced by H-bond formation between the CO and NH belonging to the enediynyl amino acid.
通过一系列基于钯(0)的 Sonogashira 偶联反应,制备出了完全受保护的新型烯二炔基三肽 2(aâc)。研究表明,这些肽的热反应性取决于氨基酸侧链的性质。对这些肽的 CD 光谱以及化学位移随温度变化的分析表明,烯二炔基氨基酸的 CO 和 NH 之间形成的 H 键诱导了δ-片状核构象与δ-片状核构象的平衡。