Synthesis and structural characterization of the individual diastereoisomers of a cross-stapled alkene-bridged nisin DE-ring mimic
作者:Jack C. Slootweg、Johan Kemmink、Rob M. J. Liskamp、Dirk T. S. Rijkers
DOI:10.1039/c3ob41359d
日期:——
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。
Step-wise and pre-organization induced synthesis of a crossed alkene-bridged nisin Z DE-ring mimic by ring-closing metathesis
作者:Nourdin Ghalit、Johan Kemmink、Hans W. Hilbers、Cees Versluis、Dirk T. S. Rijkers、Rob M. J. Liskamp
DOI:10.1039/b618085j
日期:——
total synthesis featuring a cross metathesis and a macrolactamization on a solid support followed by a ring-closingmetathesis in solution. Via this route the title compound was obtained in an overall yield of 7% (85% on average for 16 reaction steps). In the second approach, the linear precursor peptide was subjected to ring-closingmetathesis and the bicyclic peptide with the correct side chain connectivity