Abstract
Cyclic peptides are attracting attention of medicinal chemists due to their increased stability in biological milieu as well as improved target binding affinities. Our laboratory has recently reported a powerful cyclization strategy that takes advantage of the spontaneous and reversible conjugation of lysine and a designed amino acid AB3 to give iminoboronates. Herein we report that Dap, a short chain homologue of lysine, displays significantly higher propensity to form iminoboronates and consequently improves the efficiency of peptide cyclization. Importantly, the preferential conjugation of AB3 to Dap allows a facile synthesis of cyclic peptides with free lysine residues.
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