Exploiting an Inherent Neighboring Group Effect of α-Amino Acids To Synthesize Extremely Hindered Dipeptides
作者:Zachary Z. Brown、Christian E. Schafmeister
DOI:10.1021/ja806063k
日期:2008.11.5
new approach to creating extremely hindered dipeptides that is operationally simple and uses mild conditions and commercially available amino acids. The approach reduces the need for protecting groups and yields urethane-protected dipeptide acids that can be used as building blocks in the synthesis of larger peptides. We propose that the reaction proceeds through a previously unexploited intramolecular
包含非天然 N-烷基氨基酸和 N-烷基-α,α-二取代氨基酸组合的高度受阻肽的产生是一项艰巨的挑战。受阻的非天然氨基酸是令人感兴趣的,因为它们对包含它们的肽具有蛋白质水解的抗性和不寻常的构象特性。为了解决这个问题,我们描述了一种创建极度受阻二肽的新方法,该方法操作简单,使用温和的条件和市售氨基酸。该方法减少了对保护基团的需求,并产生了氨基甲酸乙酯保护的二肽酸,可用作合成较大肽的构件。我们建议该反应通过以前未开发的分子内 O,N-酰基转移途径进行。