Synthesis of Ureidopeptides and Peptidyl Ureas Employing Bsmoc Chemistry

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This work describes the utility of Bsmoc group in the synthesis of ureidopeptides and peptidyl ureas. The reaction of isocyanates derived from Bsmoc-α-amino acids with amino acid ester has yielded the ureidopeptides in good yields. The isocyanates were obtained by subjecting Bsmoc-amino acid azides to Curtius rearrangement. Bsmoc protected ureidopeptides have been isolated as solids and characterized by 1H NMR, 13C NMR and mass spectrum.

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