Peptide Syntheses with theN-PChd Protective Group Synthesis of the Hydrophobic Segment 14–20 L-Ala-Leu-Ile-Leu-Leu-Ala-Gln of Human Lymphoblastoid Interferon
作者:Mohamed Hassen Khalifa、Günther Jung、Anton Rieker
DOI:10.1002/jlac.198219820608
日期:1982.6.16
Amino acid esters were transformed in 59–97% yields into N-(3,5-di-tert-butyl-4-oxo-1-phenyl-2,5-cyclohexadienyl)amino acid esters (N-PChd amino acid esters) 8via anodic oxidation in the presence of 2,6-di-tert-butyl-4-phenylphenol (1a). Hydrolysis of 8 lead to the corresponding N-PChd amino acids 9. The novel PChd protective group is stable towards basic reagents, it can be removed by hydrogenation
氨基酸酯以59–97%的产率转化为N-(3,5-二叔丁基-4-氧代-1-苯基-2,5-环己二烯基)氨基酸酯(N -PChd氨基酸酯)8经由在2,6-存在阳极氧化二-叔丁基-4-苯基苯酚(1A)。水解8导致相应的N -PChd氨基酸9。新型的PChd保护基对碱性试剂稳定,可以通过氢化或酸解去除,并且对寡肽在有机溶剂中表现出良好的增溶性能。ñ-PChd氨基酸无需消旋就可以偶联,它们易于制备和存储,并且易于结晶。-使用常规的肽合成方法和在二氯甲烷中或在催化氢化中用10–50%三氟乙酸进行PChd脱保护的方法,制备了七肽HuIFN-α(Ly)14–20 L-Ala-Leu-Ile-Leu-Leu-Ala-Gln。如柱色谱和薄层色谱法,13 C-NMR光谱法,手性气相色谱法和常用分析方法所示,合成得到的收率和纯度均很高。