A practical, one-pot protocol is described for the conversion of carboxylicacids into amides through carboxyl activation by the reagent combination of trimethylphosphite and iodine. This method integrates several advantages: (1) it allows amines to be chemoselectively acylated with excellent results in the presence of sulfur and oxygen nucleophiles; (2) the method shows wide generality in respect
Tandem deprotection/coupling for peptide synthesis in water at room temperature
作者:Margery Cortes-Clerget、Jean-Yves Berthon、Isabelle Krolikiewicz-Renimel、Laurent Chaisemartin、Bruce H. Lipshutz
DOI:10.1039/c7gc01575e
日期:——
A tandem deprotection/coupling sequence is reported for solution-phasepeptidesynthesis in water under micellar catalysis conditions using the designer surfactant TPGS-750-M. Cbz deprotection followed by peptide coupling in the presence of COMU and 2,6-lutidine afforded polypeptides containing up to 10 amino acid residues. A broad scope characterizes this new technology. No epimerization has been
Studies on amino acids and peptides-III. 2,4-bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane 2,4-disulfide, , as a new racemization free coupling reagent in peptide synthesis
of N-protected aminoacids (Z-Gly-OH, Boc-Gly-OH, Boc-S-Ser(Bzl)-OH, Boc-S-Tyr(Bzl)-OH, Z-S-Arg(Z2)-OH, and Z-S-Pro-OH), at room temperature in CH2Cl2 to give the intermediates , mixed anhydrides. When is treated with two moles of a base and one mole of the salt of an aminoacid ester (TosOH·H-Gly-OBzl, HCl·H-Gly-OBzl, HCl·H-Gly-OEt, and HCl·H-S-Phe-OtBu) at 0°C, the expected peptide is isolated in
A new method for the synthesis of carboxamides and peptides using 1,1′-carbonyldioxydi[2(1H)-pyridone] (CDOP) in the absence of basic promoters
作者:Isamu Shiina、Yo-ichi Kawakita
DOI:10.1016/s0040-4039(03)00063-7
日期:2003.2
Various carboxamides or peptides are synthesized from the corresponding carboxylic acids and amines or α-amino acids using 1,1′-carbonyldioxydi[2(1H)-pyridone]. The reaction proceeds in the absence of basic promoters such as triethylamine or 4-(dimethylamino)pyridine, therefore, the undesired racemization does not occur at all in the segment coupling producing Z-Gly-Phe-Val-OMe and Z-Phe-Val-Ala-OMe