Preparation, Isolation, and Characterization of <i>N</i><sup>α</sup>-Fmoc-peptide Isocyanates: Solution Synthesis of Oligo-α-peptidyl Ureas
作者:Vommina V. Sureshbabu、Basanagoud S. Patil、Rao Venkataramanarao
DOI:10.1021/jo0611723
日期:2006.9.1
Nα-Fmoc-tripeptidyl urea ester and acids containing one each of peptide bond and urea bond. The divergent approach is extended to the synthesis of tetrapeptidyl ureas by the 2 + 2 strategy using bis-TMS−peptide acid as an amino component. To incorporate urea bonds in adjacent positions, Nα-Fmoc-peptidyl urea isocyanates 9a−d were prepared and employed in the synthesis of three tetrapeptidyl ureas 10a−b and 11
Suresh Babu, Vommina V.; Vasanthakumar, Ganga-Ramu; Patil, Basanagoud S., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2005, vol. 44, # 9, p. 1853 - 1858
作者:Suresh Babu, Vommina V.、Vasanthakumar, Ganga-Ramu、Patil, Basanagoud S.
DOI:——
日期:——
An Efficient Conversion of the Carboxylic Group of <i>N</i>-Fmoc α-Amino Acids/Peptide Acids into <i>N</i>-Formamides Employing Isocyanates as Key Intermediates
作者:N. S. Sudarshan、N. Narendra、H. P. Hemantha、Vommina V. Sureshbabu
DOI:10.1021/jo701371k
日期:2007.12.1
[Graphics]Reaction of 96% formic acid with isocyanates derived from N-Fmoc alpha-amino acids/peptide acids catalyzed by DMAP has yielded a new class of stable formamides as crystalline solids which have been characterized by IR, H-1 NMR, C-13 NMR, and mass spectroscopy. Conversion of the side chain carboxylic acid of N-Fmoc-5-oxazolidinones of Asp/Glu into the N-formyl group also has been accomplished. The reaction is simple, mild, and high yielding.