Synthesis of <i>N</i><sup>α</sup>-(1-Phenyl-2-mercaptoethyl) Amino Acids, New Building Blocks for Ligation and Cyclization at Non-Cysteine Sites: Scope and Limitations in Peptide Synthesis
作者:Sylvie Tchertchian、Oliver Hartley、Paolo Botti
DOI:10.1021/jo049471k
日期:2004.12.1
yielded the desired peptide fragments. However, the coupling of the two alanine derivative diastereomers generated some epimerization. Finally, N-terminal auxiliary glycine and alanine peptides were cyclized, and the corresponding native circular peptides were obtained upon successful removal of the auxiliary.
用于合成和掺入一种新的和方便的方法Ñ α - (1-苯基-2-巯基乙基) -衍生的氨基酸适用于在非半胱氨酸位点的化学连接被呈现。ñ α-使用还原胺化方法容易制备甘氨酸和丙氨酸的辅助衍生物。研究了将这些衍生物掺入肽链的几种策略:偶联而不进行保护,酸不稳定的保护,碱基不稳定的保护以及使用噻唑烷衍生物的新颖保护策略。将所有氨基酸衍生物成功地偶联到各种肽树脂上,除掺入Boc保护的衍生物外,所有树脂均产生所需的肽片段。然而,两个丙氨酸衍生物非对映异构体的偶联产生一些差向异构。最后,将N-末端辅助甘氨酸和丙氨酸肽环化,并在成功去除辅助物后获得相应的天然环状肽。