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Synthesis 2005(3): 397-402
DOI: 10.1055/s-2005-861782
DOI: 10.1055/s-2005-861782
PAPER
© Georg Thieme Verlag Stuttgart · New York
N-(Cbz- and Fmoc-α-aminoacyl)benzotriazoles: Stable Derivatives Enabling Peptide Coupling of Tyr, Trp, Cys, Met, and Gln with Free Amino Acids in Aqueous Media with Complete Retention of Chirality
Further Information
Received
12 October 2004
Publication Date:
18 January 2005 (online)
Publication History
Publication Date:
18 January 2005 (online)
Abstract
Crystalline, chirally stable N-(Cbz- and Fmoc-α-aminoacyl)benzotriazoles 2a-f, activated derivatives of Tyr, Trp, Cys, Met and Gln undergo peptide coupling in aqueous media with unprotected l-Ala-OH and l-Phe-OH to give the chiral dipeptides in 70-98% yield. A convenient and efficient procedure under mild reaction conditions for the preparation of 2a-f in 72-95% yield utilizes N-Cbz- or N-Fmoc-protected α-amino acids 1a-f.
Key words
N-(protected α-aminoacyl)benzotriazole - benzotriazole - amino acid - acylating reagent - peptide coupling
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