Herein, we describe the synthesis, structural characterization, and synthetic use as an advanced intermediate of a cross-stapled alkene-bridged hexapeptide to mimic the DE-ring of the lantibiotic nisin. The linear precursor was cyclized by ring-closing metathesis to give the correctly folded bicyclic hexapeptide in a single step, and the four individual diastereoisomers were isolated, structurally assigned and characterized by HPLC, NMR and MS, respectively. The bicyclic hexapeptide was used as a versatile advanced synthon and was modified at its C- and N-terminus, among others, with an azide moiety to access a building block suitable for Cu(I)-catalyzed alkyne–azide cycloaddition-based ligation reactions.
在本文中,我们介绍了一种交叉叠层烯桥六肽的合成、结构表征和作为高级中间体的合成用途,这种六肽可以模拟兰替比星的 DE 环。线性前体通过闭环偏析环化,一步就得到了折叠正确的双环六肽,并分离出四种非对映异构体,分别通过 HPLC、NMR 和 MS 对其进行结构鉴定和表征。该双环六肽被用作一种多功能高级合成物,并在其 C 端和 N 端用
叠氮基等进行了修饰,从而获得了一种适合 Cu(I)- 催化的炔
吖啶环化连接反应的构筑基块。