Z or Fmocaminoacidfluorides have been prepared from the protected aminoacids and cyanuric fluoride, and have been tested both in the condensation with simple aminoacid esters and in Solid Phase PeptideSynthesis.
A Convenient, One-Pot Procedure for the Preparation of Acyl and Sulfonyl Fluorides Using Cl3CCN, Ph3P, and TBAF(t-BuOH)4
作者:Doo Jang、Joong-Gon Kim
DOI:10.1055/s-0030-1259051
日期:2010.12
Various carboxylic acids were converted into acyl fluorides in excellent yields by treatment with trichloroacetonitrile, triphenylphosphine, and TBAF(t-BuOH) 4 at room temperature. The reaction was applicable to the preparation of acid-sensitive amino acid fluorides without deprotection or rearrangement.
δ-Azaproline, a bis-nitrogen proline, has been incorporated in pseudotripeptides of the type Xaa1-δazaPro-Xaa3. Peptide elongation via both nitrogen atoms has been explored by peptide coupling with glycine and/or alanine amino acids showing higher reactivity though an extra Nδ atom compare to the native Nε extremity. Carbonyls of some pseudopeptides have been converted into their thioanalogues. The
A new bio-inspired approach is reported for amide and peptide synthesis using α-amino esters that possess a potential activating group (PAG) at the ester residue. To activate the ester functionality under mild metal-free conditions, we exploited the facile dearomatization of phenols with hypervalent iodine(III) reagents. Using a pyridine–hydrogen fluoride complex, highly reactive acyl fluoride intermediates
Synthesis and Conformational Study of Model Peptides Containing<i>N</i>-Substituted 3-Aminoazetidine-3-carboxylic Acids
作者:Asta Žukauskaitė、Alessandro Moretto、Cristina Peggion、Marta De Zotti、Algirdas Šačkus、Fernando Formaggio、Norbert De Kimpe、Sven Mangelinckx
DOI:10.1002/ejoc.201301741
日期:2014.4
N-substituted 3-aminoazetidine-3-carboxylic acids have been synthesized to investigate the conformational features of these C-tetrasubstituted amino acids. The target peptides were designed and prepared by classical synthetic methods in solution, exploiting the convenient N-substituted 3-azidoazetidine-3-carboxylic acids as precursors. The conformational preferences of the newly synthesized peptides