Side Reaction with N-Carboxymethyl Amino Acids in the Synthesis of Backbone Cyclized Peptides |
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Authors: | Diana Besser Georg Greiner Siegmund Reissmann |
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Affiliation: | (1) Institut für Biochemie und Biophysik, Friedrich-Schiller-Universität Jena, Philosophenweg 12, D-07743 Jena, Germany |
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Abstract: | The use of N-carboxymethyl amino acids in the assembly of peptides with backbone cyclization can lead to diketopiperazine formation by intramolecular aminolysis which occurs despite the tert-butyl protection of the carboxy group. This undesired side reaction can be prevented by a very short deprotection time for the Fmoc group, by elongation of the N-carboxyalkyl chain or by forming the backbone (lactam) bridge before Fmoc removal, but not by the use of DBU or additives. |
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Keywords: | backbone cyclization bradykinin branched building units diketopiperazine formation |
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