Synthesis and cytotoxicity evaluation of retro-inverso analogue of antitumor bicyclic hexapeptide RA-VII
作者:Rikito Suzuki、Ryota Masuda、Hidetaka Yamamoto、Haruhiko Fukaya、Tomoyo Hasuda、Yukio Hitotsuyanagi
DOI:10.1016/j.tetlet.2023.154839
日期:2024.1
macrocyclization using diphenylphosphoryl azide and NaHCO3 in N,N-dimethylformamide to afford a bicyclic hexapeptide analogue. X-ray crystallography and NMR experiments showed that the analogue had different structural features from RA-VII, which were responsible for the lack of cytotoxic activity of the analogue.
设计并合成了抗肿瘤双环六肽RA-VII的逆向类似物。通过乙酸铜(II)和4-(二甲氨基)吡啶介导的Boc-3-硼基-d-Tyr(Me)-d-Tyr-OMe的分子内二苯醚形成合成了环异二酪氨酸单元。N-甲基化后,Boc-Ala-OH和三肽片段依次偶联至环异二酪氨酸单元的N-末端,得到六肽。除去C-和N-末端保护基团后,使用二苯基磷酰叠氮化物和NaHCO 3在N,N-二甲基甲酰胺中对六肽进行大环化,得到双环六肽类似物。X射线晶体学和NMR实验表明该类似物具有与RA-VII不同的结构特征,这导致该类似物缺乏细胞毒活性。