开发了两种新的可回收硅基疏水标签,用于将它们安装在肽的 C 端,以增加在有机溶剂中的溶解度和液相肽合成 (LPPS) 过程中肽的反应性。它们包含含有甲硅烷氧基的标签和含有芳基甲硅烷基的标签。这些标签的疏水性比以前报道的例子要大得多。含有甲硅烷氧基的标签与Fmoc-脱保护条件(Fmoc-化学)和氢化条件(Cbz-化学)相容,而含有芳基甲硅烷基的标记对Fmoc-脱保护条件(Fmoc-化学)和Boc-脱保护条件具有抗性( Boc-化学)。使用含甲硅烷氧基的标签,受保护的 DRGN-1,采用线性合成结合一个收敛合成步骤成功制备了含有14个氨基酸残基的多肽。使用含有芳基甲硅烷基的标签,合成了含有 7 个丙氨酸残基的聚丙氨酸链。含有芳基甲硅烷基的标签也可以安装在 N 端,以将肽从 N 端延伸到 C 端。在这些硅基标签的帮助下,每一步的产率和产品在有机溶剂中的溶解度都非常好。
A Lewis-acid-catalyzed method for the substrate-directed formation of peptide bonds has been developed, and this powerful approach is utilized for the new "remote" activation of carboxyl groups under solvent-free conditions. The presented method has the following advantages: 1) the high-yielding peptidesynthesis uses a tantalum catalyst for any amino acids; 2) the reaction proceeds without any racemization;
Provided is a novel method for producing amide compounds at high stereochemical selectivities. The method according to the present invention for producing amide compounds is provided with an amidation step for reacting, in the presence of a catalyst comprising a metal compound, an amino compound with an aminoester compound represented by general formula (1) to amidate the ester group in the aminoester compound.