A Quaternary Nitronyl Nitroxide α-Amino Acid: Synthesis, Configurational and Conformational Assignments, and Physicochemical Properties
作者:Karen Wright、Edouard d'Aboville、Joseph Scola、Tommaso Margola、Antonio Toffoletti、Marta De Zotti、Marco Crisma、Fernando Formaggio、Claudio Toniolo
DOI:10.1002/ejoc.201301765
日期:2014.3
nitronyl nitroxide α-amino acids, we report here the synthesis of a novel, conformationally constrained, quaternary, chiral residue, Aic(CN), and its subsequent conversion into a blue-colored, imidazolinyl nitronyl nitroxide-bearing α-amino acid, Aic(NN). Deprotection and peptide coupling reactions were examined. The configurational assignment of Aic(NN) was achieved by X-ray crystallographic analysis of
为了扩展目前极其有限的已知硝酰基氮氧化合物 α-氨基酸库,我们在此报告了一种新型的、构象受限的、四元的、手性残基 Aic(CN) 的合成,并随后将其转化为蓝色的咪唑啉基硝酰基含氮氧化物的α-氨基酸,Aic(NN)。检查了脱保护和肽偶联反应。Aic(NN) 的构型分配是通过适当三肽的 X 射线晶体学分析实现的。后一项研究伴随着红外吸收构象分析,强烈支持 Aic(NN) 残基是一种有效的肽转折形成剂的观点。还描述了其衍生物和三肽的许多光谱和磁性特性。与未来应用特别相关的是其 UV/Vis 吸收、NMR、