Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 3, Issue 2, Pages 454-461Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.200700305
Keywords
carboxamides; oligopeptides; peptide coupling; peptides; synthetic methods
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Various carboxamides or peptides were synthesized from the corresponding carboxylic acids and amines or alpha-amino acids in high yields by the catalysis of 4-(dimethylamino)pyridine N-oxide (DMAPO) with 2-methyl-6-nitrobenzoic anhydride (MNBA). Because the segment-coupling reaction of alpha-amino acids proceeds through the effective activation of the carboxylic acid moieties with DMAPO in the presence of tertiary amines under mild conditions, undesired racemization was hardly observed in the synthesis of oligopeptides such as Z-Gly-Phe-Val-OMe, Z-Phe-Val-Ala-OMe, and Bz-Val-Val-OMe.
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