Synthesis 2004(16): 2645-2652  
DOI: 10.1055/s-2004-831255
PAPER
© Georg Thieme Verlag Stuttgart · New York

Highly Diastereoselective Peptide Chain Extensions of Unprotected Amino Acids with N-(Z-α-Aminoacyl)benzotriazoles

Alan R. Katritzky*, Kazuyuki Suzuki, Sandeep K. Singh
Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, FL 32611-7200, USA
e-Mail: katritzky@chem.ufl.edu;
Further Information

Publication History

Received 13 May 2004
Publication Date:
06 October 2004 (online)

Abstract

Coupling an unprotected amino acid or dipeptide in partially aqueous solution with a readily available N-(Z-α-amino­acyl)benzotriazole or N-(Z-α-aminopetidoyl)benzotriazole affords N-terminal-protected di-, tri-, and tetrapeptides in yields of 85-98% (average 95% for 2a-i, 93% for 4a-f and 4a′, 86% for 5a-b) with minimal epimerization.