Oxyma: An Efficient Additive for Peptide Synthesis to Replace the Benzotriazole‐Based HOBt and HOAt with a Lower Risk of Explosion[1] |
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| Authors: | Ramon Subirós‐Funosas Rafel Prohens Rafael Barbas Ayman El‐Faham Prof Fernando Albericio Prof |
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| Institution: | 1. Institute for Research in Biomedicine, Barcelona Science Park, Baldiri Reixac 10, 08028 Barcelona (Spain), Fax: (+34)?93‐403‐71‐26;2. CIBER‐BBN, Networking Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona Science Park, Baldiri Reixac 10–12, 08028 Barcelona (Spain);3. Plataforma de Polimorfisme i Calorimetria, Serveis Cientificotècnics, University of Barcelona, Barcelona Science Park, Baldiri Reixac 10–12, 08028 Barcelona (Spain);4. Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451 (Saudi Arabia);5. Department of Chemistry, Faculty of Science, Alexandria University, Ibrahimia 21321, Alexandria (Egypt);6. Department of Organic Chemistry, University of Barcelona, Martí i Franqués 1–11, 08028 Barcelona (Spain) |
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| Abstract: | Oxyma ethyl 2‐cyano‐2‐(hydroxyimino)acetate] has been tested as an additive for use in the carbodiimide approach for formation of peptide bonds. Its performance in relation to those of HOBt and HOAt, which have recently been reported to exhibit explosive properties, is reported. Oxyma displayed a remarkable capacity to inhibit racemization, together with impressive coupling efficiency in both automated and manual synthesis, superior to those of HOBt and at least comparable to those of HOAt, and surpassing the latter coupling agent in the more demanding peptide models. Stability assays showed that there was no risk of capping the resin under standard coupling conditions. Finally, calorimetry assays (DSC and ARC) showed decomposition profiles for benzotriazole‐based additives that were consistent with their reported explosivities and suggested a lower risk of explosion in the case of Oxyma. |
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| Keywords: | additives calorimetry oximes peptide synthesis solid‐phase synthesis |
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