Suzuki-Miyaura Diversification of Amino Acids and Dipeptides in Aqueous Media
作者:Tom Willemse、Karolien Van Imp、Rebecca J. M. Goss、Herman W. T. Van Vlijmen、Wim Schepens、Bert U. W. Maes、Steven Ballet
DOI:10.1002/cctc.201500190
日期:2015.7.13
modification of unprotected and Boc‐protected aromatic amino acids and dipeptides in aqueous media, enabling heteroarylation and vinylation. We systematically investigate the impact of the peptide backbone and adjacent amino acid residues upon the reaction. Our studies reveal that although asparagine and histidine hinder the reaction, by utilising dppf, a ferrocene‐based bidentate phosphine ligand, cross coupling
Synthesis of Heterocycle-Bridged Peptidic Macrocycles through 1,3-Diyne Transformations
作者:Steven Verlinden、Steven Ballet、Guido Verniest
DOI:10.1002/ejoc.201601215
日期:2016.12
various heterocycles by nucleophilic attack of (bis)nucleophiles to the diyne moiety. Treatment with NaHS or H2O as nucleophiles gave rise to 2,5-bridged thiophenes or furans, whereas the use of hydrazines and hydroxylamine gave rise to the corresponding pyrazole- and isoxazole-containing macrocycles. In addition, a thermoreversible Diels–Alder cycloaddition of a cyclopeptidic bridged furan was demonstrated
Biaryl-Bridged Macrocyclic Peptides: Conformational Constraint via Carbogenic Fusion of Natural Amino Acid Side Chains
作者:Falco-Magnus Meyer、James C. Collins、Brendan Borin、James Bradow、Spiros Liras、Chris Limberakis、Alan M. Mathiowetz、Laurence Philippe、David Price、Kun Song、Keith James
DOI:10.1021/jo202105v
日期:2012.4.6
A general method for constraining peptide conformations via linkage of aromatic sidechains has been developed. Macrocydization of suitably functionalized tri-, tetra- and pentapeptides via Suzuki-Miyaura cross-coupling has been used to generate side chain to side chain, biaryl-bridged 14- to 21-membered macrocyclic peptides. Biaryl bridges possessing three different configurations, meta-meta, meta-ortho, and ortho-meta, were systematically explored through regiochemical variation of the aryl halide and aryl boronate coupling partners, allowing fine-tuning of the resultant macrocycle conformation. Suzuki-Miyaura macrocyclizations were successfully achieved both in solution and on solid phase for all three sizes of peptide. This approach constitutes a means of constraining peptide conformation via direct carbogenic fusion of side chains of naturally occurring amino acids such as phenylalanine and tyrosine, and so is complementary to strategies involving non-natural, for example, hydrocarbon, bridges.