C → N and N → C solution phase peptide synthesis using the N-acyl 4-nitrobenzenesulfonamide as protection of the carboxylic function
作者:Rosaria De Marco、Mariagiovanna Spinella、Anna De Lorenzo、Antonella Leggio、Angelo Liguori
DOI:10.1039/c3ob40169c
日期:——
In this paper we describe a solution phase peptide synthesis strategy using the 4-nitrobenzenesulfonamido/N-methyl-4-nitrobenzenesulfonamido group as a protecting/activating system of the carboxyl function. The 4-nitrobenzenesulfonamido group is stable during peptide chain elongation (Fmoc chemistry). The N-aminoacyl or N-dipeptidyl-4-nitrobenzensulfonamides, when activated by methylation, can be easily coupled with another amino acid or reconverted into the free-carboxyl function amino acids or peptides. This activatable protecting group allows both the C â N and the N â C direction solution phase peptide synthesis. We also verified that the absolute configuration at the chiral centers does not change during the coupling reactions.
本文中,我们描述了一种利用4-硝基苯磺酰胺/N-甲基-4-硝基苯磺酰胺基团作为羧基保护/活化系统的溶液相肽合成策略。4-硝基苯磺酰胺基团在肽链延长过程中稳定存在(Fmoc化学)。N-酰胺基或N-二肽基-4-硝基苯磺酰胺,在甲基化活化后,能容易地与另一个氨基酸结合或重新转换成自由羧基功能的氨基酸或肽。这种可活化的保护基团允许双向溶液相肽合成,即C→N和N→C方向。我们还验证了在偶联反应过程中不对称中心的绝对构型保持不变。