Cobalt(III)‐Catalyzed C−H Amidation of Dehydroalanine for the Site‐Selective Structural Diversification of Thiostrepton
作者:Ryan J. Scamp、Edward deRamon、Eric K. Paulson、Scott J. Miller、Jonathan A. Ellman
DOI:10.1002/anie.201911886
日期:2020.1.7
Thiostrepton is a potent antibiotic against a broad range of Gram-positive bacteria, but its medical applications have been limited by its poor aqueous solubility. In this work, the first C(sp2 )-H amidation of dehydroalanine (Dha) residues was applied to the site selective modification of thiostrepton to prepare a variety of derivatives. Unlike all prior methods for the modification of thiostrepton
硫链丝菌素是一种针对多种革兰氏阳性菌的有效抗生素,但其医疗应用因其水溶性差而受到限制。本工作首次将脱氢丙氨酸(Dha)残基的C(sp2)-H酰胺化应用于硫链丝菌肽的位点选择性修饰,制备了多种衍生物。与所有现有的硫链丝菌肽修饰方法不同,Dha 残基的烯烃骨架得以保留,并且对 Z-立体异构体具有完全选择性。此外,通过 CH 酰胺化引入醛基,使肟连接能够安装更广泛的功能。硫链丝菌素衍生物通常保持抗菌活性,重要的是,其中八种衍生物的水溶性得到改善(高达 28 倍),从而解决了这种抗生素的一个关键缺点。CoIII 催化的 C(sp2 )-H Dha 酰胺化的特殊官能团相容性和位点选择性表明该方法可以推广到含有 Dha 残基的其他天然产物和生物聚合物。