A Versatile Scaffold for Site-Specific Modification of Cyclic Tetrapeptides

[摘要]：A novel scaffold that can be used to prepare conformationally homogeneous cyclic tetrapeptides equipped with a beta-amino acid residue is disclosed. It Is shown that regioselective structural modification can be accomplished using thiols and azide nucleophiles, commonly associated with rich downstream chemistry. The method should find application in efforts to constrain privileged tripeptide sequences in rigid molecular scaffolds.

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