Stereochemical aspects in the synthesis of novel N-(purin-6-yl)dipeptides as potential antimycobacterial agents
作者:Vera V. Musiyak、Irina A. Nizova、Evgeny N. Chulakov、Liliya Sh. Sadretdinova、Andrey A. Tumashov、Galina L. Levit、Victor P. Krasnov
DOI:10.1007/s00726-021-02958-0
日期:2021.3
The synthesis of purine conjugates with natural amino acids is one of the promising directions in search for novel therapeutic agents, including antimycobacterial agents. The purpose of this study was to synthesize N-(purin-6-yl)dipeptides containing the terminal fragment of (S)-glutamic acid. To obtain the target compounds, two synthetic routes were tested. The first of them is based on coupling of
嘌呤缀合物与天然氨基酸的合成是寻找新型治疗剂(包括抗分枝杆菌剂)的有希望的方向之一。本研究的目的是合成含有( S )-谷氨酸末端片段的N- (purin-6-yl)二肽。为了获得目标化合物,测试了两种合成路线。其中第一个是基于在碳二亚胺偶联剂存在下将 N-(purin - 6-yl)-( S )-氨基酸与 (S)-谷氨酸二甲酯偶联,然后去除酯基。然而,事实证明,这种偶联过程伴随着N的手性中心的消旋化。-(purin-6-yl)-α-氨基酸,在所有情况下都会产生 ( S,S )- 和 ( R,S )-非对映异构体 (6:4) 的混合物。使用基于氯在 6-氯嘌呤或 2-氨基-6-氯嘌呤中的亲核取代以及相应的二肽作为亲核试剂的替代方法获得单个 ( S,S )-非对映异构体。目标化合物的对映体纯度通过手性 HPLC 确认。为了检验N- (purin-6-yl)-α-氨基酸的手性中心消旋化发生在咪唑