Ligand-Enabled Copper-Catalyzed <i>N</i>-Alkynylation of Sulfonamide with Alkynyl Benziodoxolone: Synthesis of Amino Acid-Derived Ynamide
作者:Ryogo Takai、Daisuke Shimbo、Norihiro Tada、Akichika Itoh
DOI:10.1021/acs.joc.1c00101
日期:2021.3.19
Ynamides are versatile building blocks in organic synthesis. However, the synthesis of amino acid-derived ynamides is difficult but in high demand. Herein, we disclose the copper-catalyzed Csp-N coupling of sulfonamide, including amino acid and peptide derivatives, to give ynamides by using alkynyl benziodoxolones with broad functional group tolerance under mild reaction conditions. The electron-rich
酰胺是有机合成中的多功能构建基块。然而,氨基酸衍生的酰胺的合成是困难的,但是需求量很大。本文中,我们公开了在温和的反应条件下,通过使用具有宽泛的官能团耐受性的炔基苯并恶唑烷酮,通过铜催化的磺酰胺(包括氨基酸和肽衍生物)的Csp-N偶联生成酰胺。为了使该反应成功,使用了富电子联吡啶作为配体,乙醇作为溶剂。通过进一步衍生化成独特的氨基酸衍生物,展示了所获得的氨基酸衍生的酰胺的有用性。还描述了阐明机理见解的对照实验。