Ethoxyethylidene protecting group prevents N-overacylation in aminooxy peptide synthesis
作者:Vincent Duléry、Olivier Renaudet、Pascal Dumy
DOI:10.1016/j.tet.2007.09.015
日期:2007.11
oxime ligation. Aminooxyacetic acid (Aoa) was protected with 1-ethoxyethylidene group (Eei) then incorporated either using PyBOP or as N-hydroxysuccinimidyl ester at N-terminal end or at a lysine side chain into model peptides in solution and on solid support. Due to the Eei protecting group, these new reagents prevent the N-overacylation side reaction in comparison with Boc–Aoa derivatives. Subsequent
我们在本文中报道了制备适合于肟连接的均质氨氧基肽的改进的合成途径。氨氧基乙酸(Aoa)用1-乙氧基亚乙基(Eei)保护,然后使用PyBOP或在N末端或赖氨酸侧链上作为N-羟基琥珀酰亚胺酯掺入溶液中和固体支持物上的模型肽中。由于具有Eei保护基,与Boc–Aoa衍生物相比,这些新试剂可防止N-过度酰化副反应。随后在温和的酸性条件下脱保护得到相应的纯氨基氧化肽。