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
Synthesis and electrochemical properties of tetrathiafulvalene derived amino acids and peptides
作者:Susan Booth、Emma N. K. Wallace、Kavita Singhal、Philip N. Bartlett、Jeremy D. Kilburn
DOI:10.1039/a800759d
日期:——
A synthetic route to a tetrathiafulvalene (TTF) derived aspartic acid derivative 18, with suitable orthogonal protecting groups has been developed. The aspartic acid derivative 18 can be used in the synthesis of peptides, as exemplified by the synthesis of di-, tri- and tetra-peptides 21–23. Preliminary electrochemical studies of these novel peptides indicate that they may well undergo conformational reorganisation upon oxidation of the TTF moieties.
base lability of nucleopeptides, their synthesis requires the application of a variety of orthogonally stable blocking groups, which can be removed under the mildest conditions. We have developed a new mild enzymatic deprotection method, that is, the penicillin G acylase-catalyzed hydrolysis of the N-phenylacetoxybenzyloxycarbony (PhAcOZ) group, for the synthesis of nucleopeptides. We demonstrate the
The first syntheses of bioactive cryptophycins functionalized at unit ID were accomplished ina one-pot Staudinger reduction/cyclization step An a/ado precursor for the lower part of the backbone was introduced to minimize protective group chemistry and enable a very convenient synthesis of cryptophycin-52 and unit D eryptophycin analogues containing an ester or a free carboxylic acid for bioconjugations Both new cryptophycin derivatives show high biological activity in cytotoxicity assays