A Tandem In Situ Peptide Cyclization through Trifluoroacetic Acid Cleavage1. (14th May 2014)

• Record Type: Journal Article
• Authors: Chandra, Koushik; Roy, Tapta Kanchan; Shalev, Deborah E.; Loyter, Abraham; Gilon, Chaim; Gerber, R. Benny; Friedler, Assaf
• Is Part Of: Angewandte Chemie. Volume 126:Number 36(2014)
• Page Start: 9604
• Page End: 9609
• Publication Date: 2014-05-14
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201402789
• Languages: English
• ISSNs: 0044-8249

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>We present a new approach for peptide cyclization during solid phase synthesis under highly acidic conditions. Our approach involves simultaneous in situ deprotection, cyclization and trifluoroacetic acid (TFA) cleavage of the peptide, which is achieved by forming an amide bond between a lysine side chain and a succinic acid linker at the peptide N‐terminus. The reaction proceeds via a highly active succinimide intermediate, which was isolated and characterized. The structure of a model cyclic peptide was solved by NMR spectroscopy. Theoretical calculations support the proposed mechanism of cyclization. Our new methodology is applicable for the formation of macrocycles in solid‐phase synthesis of peptides and organic molecules.</p> </abstract>