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‐Directed Late‐Stage Ligation and Macrocyclization of Peptides with Olefins by Rhodium Catalysis
作者:Lei Liu、Xinlong Fan、Boning Wang、Hong Deng、Tianhang Wang、Jie Zheng、Jun Chen、Zhuangzhi Shi、Huan Wang
DOI:10.1002/anie.202206177
日期:2022.8
A method for late-stage peptide ligation and macrocyclizationthrough rhodium-catalyzed C7-selective alkylation of tryptophan residues has been developed. This method is compatible with internal olefins and represents the first example of site-selective peptide C−H alkylation through deconjugative isomerization.
efficient electrochemical Ni-catalyzed alkene hydrogenation is described. The reaction features outstanding substrate generality and functional group compatibility, and distinct chemoselectivity. Notably, hydrodebromination of alkyl and aryl bromides can be realized using the same reaction system with a different ligand, and high chemoselectivity between hydrogenation of alkene and hydrodebromination could
Cross-metathesis and ring-closing metathesis reactions of amino acid-based substrates
作者:Andrea J. Vernall、Steven Ballet、Andrew D. Abell
DOI:10.1016/j.tet.2008.02.043
日期:2008.4
Olefin tethers of variable length, introduced into a natural amino acid (side-chain of Ser, Cys; N-terminus of Arg; C-terminus of Phe and Tic; and in both the side-chain and either the N- or C-terminus of Ser, Cys and Tyr), undergo metathesis on treatment with Grubbs' second generation catalyst. Side-chain linked dimers of Ser, Cys and Tyr were obtained by cross-metathesis, while olefin installation at the N- and C-terminus led to dimers of Arg and Phe (or Tic), respectively. Ring-closing metathesis of the doubly alkenylated derivatives of Ser, Cys and Tyr gave 12-, 20- and 24-membered macrocycles. (c) 2008 Elsevier Ltd. All rights reserved.