A process for the production of tetra- and trialkylsilanes which comprises reacting (A) an alkylchlorosilane having the formula R.sub.x SiCl.sub.(4-x) wherein R is an alkyl radical containing from one to three carbon atoms per molecule and x is an integer from 0 to 3, with (B) a trialkylaluminum compound having the formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are the same or different and represent alkyl radicals containing from 6 to 20 carbon atoms per molecule, in a reaction zone, said reaction being conducted under hydrosilylation conditions. Selectivity to tetra- or trialkylsilanes, respectively, is controlled by the addition of particular alkaline metal salts to the reaction zone.
installing them at the C-terminal of peptides to increase the solubility in organic solvents and the reactivity of the peptidesduring liquid-phase peptidesynthesis (LPPS). They comprise a siloxy group containing tag and an arylsilyl group containing tag. The hydrophobicity of these tags is much greater than those of previously reported examples. The siloxy group containing tag is compatible with Fmoc-deprotection
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。