Selective Side Chain Introduction onto Small Peptides Mediated by Samarium Diiodide: A Potential Route to Peptide Libraries
作者:Marina Ricci、Peter Blakskjær, and、Troels Skrydstrup
DOI:10.1021/ja0024800
日期:2000.12.1
A mild and simple method for the selective introduction of carbinol side chains onto glycine residues in peptides is presented as a potential route for the preparation of peptide libraries. A series of di- and tripeptides, as well as one tetrapeptide, each possessing one glycine residue, were first selectively functionalized at this amino acid unit by a two-step sequence involving bromination with
提出了一种将甲醇侧链选择性引入肽中甘氨酸残基的温和简单的方法,作为制备肽库的潜在途径。一系列二肽和三肽,以及一个四肽,每个都有一个甘氨酸残基,首先通过两步序列在这个氨基酸单元上选择性地功能化,包括用 N-溴代琥珀酰亚胺溴化,然后通过处理不稳定的物质形成硫化物。甘氨酰溴与 2-巯基吡啶。然后在烷基醛和酮的存在下,在室温下用二碘化钐还原这些修饰的肽,以 40-65% 的产率提供一系列含有丝氨酸/苏氨酸衍生物作为新功能的肽。这些反应相当有效,考虑到烯醇中间体中存在多达四个酰胺质子。这些反应的非对映选择性很低或不存在,这归因于 (a) 单一烯醇的形成...