Thiazolidine-Protected β-Thiol Asparagine: Applications in One-Pot Ligation–Desulfurization Chemistry
作者:Jessica Sayers、Robert E. Thompson、Kristen J. Perry、Lara R. Malins、Richard J. Payne
DOI:10.1021/acs.orglett.5b02468
日期:2015.10.2
The synthesis of a β-thiol asparagine derivative bearing a novel (2,4,6-trimethoxyphenyl)thiazolidine protecting group is described. The efficient incorporation of the amino acid into the N-termini of peptides is demonstrated as well as the utility of the β-thiol asparagine moiety for rapid ligation reactions with peptide thioesters. The streamlined synthesis of native peptide products could be accomplished
Oxidative Deselenization of Selenocysteine: Applications for Programmed Ligation at Serine
作者:Lara R. Malins、Nicholas J. Mitchell、Sheena McGowan、Richard J. Payne
DOI:10.1002/anie.201504639
日期:2015.10.19
Despite the unique chemical properties of selenocysteine (Sec), ligation at Sec is an under‐utilized methodology for protein synthesis. We describe herein an unprecedented protocol for the conversion of Sec to serine (Ser) in a single, high‐yielding step. When coupled with ligation at Sec, this transformation provides a new approach to programmedligations at Ser residues. This new reaction is compatible
Trifluoroethanethiol: An Additive for Efficient One-Pot Peptide Ligation−Desulfurization Chemistry
作者:Robert E. Thompson、Xuyu Liu、Noelia Alonso-García、Pedro José Barbosa Pereira、Katrina A. Jolliffe、Richard J. Payne
DOI:10.1021/ja502806r
日期:2014.6.11
Here we describe the development of a high-yielding, one-pot ligation-desulfurization protocol that uses trifluoroethanethiol (TFET) as a novel thiol additive. The synthetic utility of this TFET-enabled methodology is demonstrated by the efficient multi-step one-pot syntheses of two tick-derived proteins, chimadanin and madanin-1, without the need for any intermediary purification.
The invention relates to a process for introducing a thiol group a to a carbonyl group in a side chain of a protected a-amino acid, said protected a-amino acid having protecting groups on both the α-amine group and the a-carboxyl group. The process comprises a) if the side chain contains a functional group comprising a heteroatom bearing a hydrogen atom, protecting said functional group; b) treating the protected amino acid with a base of sufficient strength to abstract a hydrogen atom a to the carbonyl group, so as to form an anion; c) treating the anion with a reagent of structure Pr-S-L in which L is a leaving group and Pr is a thiol-protecting group, so as to introduce a Pr-S- group a to the carbonyl group; and d) converting the Pr-S- group to an H-S-(thiol) group. This process may be used to prepare ligated peptides.
One-Pot Peptide Ligation–Desulfurization at Glutamate
作者:Katie M. Cergol、Robert E. Thompson、Lara R. Malins、Peter Turner、Richard J. Payne
DOI:10.1021/ol403288n
日期:2014.1.3
steps from protected glutamic acid and could be incorporated at the N-terminus of peptides. The application of these peptides in one-pot ligation–desulfurization chemistry is demonstrated with a range of peptide thioesters, and the utility of this methodology is highlighted through the synthesis of the osteoporosis peptide drug teriparatide (Forteo).