Synthesis of a conformationally constrained δ-amino acid building block
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Conformationally restricted amino acids are important components in peptidomimetics and drug design. Herein, we describe the synthesis of a novel, non-proteinogenic constrained delta amino acid containing a cyclobutane ring, cis-3(aminomethyl)cyclobutane carboxylic acid (ACCA). The synthesis of the target amino acid was achieved in seven steps, with the key reaction being a base induced intramolecular nucleophilic substitution. A small library of dipeptides was prepared through the coupling of ACCA with proteinogenic amino acids.
KeywordsNon-proteinogenic amino acid Dipeptides Conformational restriction Cyclobutane ring
We would like to thank the Irish Research Council for Science, Engineering and Technology (IRCSET) for funding this research. We would also like to acknowledge the facilities of the Centre for Synthesis and Chemical Biology (CSCB), funded by the Higher Education Authority’s Programme for Research in Third-Level Institutions (PRTLIs). We are grateful to Dr. Jimmy Muldoon for his help with the NMR experiments.
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