Rapid acidolysis of benzyl group as a suitable approach for syntheses of peptides naturally produced by oxidative stress and containing 3-nitrotyrosine
作者:Petr Niederhafner、Martin Šafařík、Eva Brichtová、Jaroslav Šebestík
DOI:10.1007/s00726-015-2163-2
日期:2016.4
could probably influence conformation of neurodegenerative proteins. Syntheses of peptides require availability of suitable synthon for introduction of Nit residue. Common phenolic protection groups are more acid labile, when they are attached to Nit residue. We have found that Fmoc–Nit(Bn)–OH is a good building block for syntheses of Nit containing peptides by Fmoc/tBu strategy. Interestingly, the
3-硝基酪氨酸(Nit)属于氧化应激产物,可能会影响神经变性蛋白的构象。肽的合成需要合适的合成子来引入Nit残基。常见的酚保护基与Nit残基连接时,酸不稳定。我们发现,Fmoc-Nit(Bn)-OH是通过Fmoc / tBu策略合成含Nit肽的良好构建基块。有趣的是,含有多个Nit残基的肽只能通过使用Fmoc-Nit(Bn)-OH合成子获得。在黑暗中用大约80%的三氟乙酸迅速去除Bn。Bn从Fmoc–Nit(Bn)–OH的裂解通过伪一级反应机制进行,激活势垒为32 kcal mol -1,速率k = 15.3 s -1在20°C下。该速率比从Tyr(Bn)裂解苄基的速率快2,000,000倍。