Abstract

An efficient and simple synthetic protocol for the synthesis of a number methyl esters of 2-(N-hydroxycarbamimidoyl)benzoyl-substituted (S)-α-amino acids via subsequent coupling and hydroxyamination of 2-cyanobenzamide derivatives has been developed. Comparative analysis of three pseudopeptide series based on 2-cyano- and 2-amidoxime-substituted benzoic acid and its pyridine and pyrazine counterparts has been provided and it has revealed a practical advantage of the benzoic acid derivatives due to their greater availability. The impact of the nitrogen atom in the aromatic ring on the trans/cis-amide equilibrium in the proline derivatives is discussed.

Graphical abstract

中文翻译：

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2-（N-羟基氨基甲酰基）苯甲酰基取代的α-氨基酸的甲酯是拟肽合成中有希望的组成部分：对比研究

摘要

已经开发了通过随后的2-氰基苯甲酰胺衍生物的偶合和羟基胺化来合成2-（N-羟基氨基甲酰基）苯甲酰基取代的（S）-α-氨基酸的许多甲酯的有效而简单的合成方案。提供了对两种基于2-氰基和2-ox肟肟取代的苯甲酸的假肽系列及其吡啶和吡嗪对应物的比较分析，并且由于其可用性更高，因此显示了苯甲酸衍生物的实际优势。讨论了芳环中氮原子对脯氨酸衍生物中反式/顺式-酰胺平衡的影响。

图形概要