Cysteine-Derived S-Protected Oxazolidinones: Potential Chemical Devices for the Preparation of Peptide Thioesters
摘要:
[GRAPHICS]An N-S acyl-transfer-mediated preparation of peptide thioesters using the S-protected oxazolidinone derived from cysteine has been developed and applied to the synthesis of a 32-mer biologically active peptide by native chemical ligation protocols.
Synthesis of thiol-modified peptide nucleic acids designed for post-assembly conjugation reactions
摘要:
Two orthogonally protected PNA monomers were prepared having the mercaptomethyl moiety attached to the PNA backbone. These building blocks were employed in solid-phase PNA synthesis and it was shown that Boc/S-p-methoxybenzyl protection scheme was only satisfactory for the introduction of N-terminal thiol modification while the Fmoc/S-butylthio protected monomer proved to be amenable to elongation. The mercaptomethyl modification did not influence the thermal stability of a PNA/RNA duplex. The feasibility of PNA-PNA native ligation was demonstrated. (c) 2006 Elsevier Ltd. All rights reserved.