Solid-phase synthesis of linear and cyclic peptides containing a calix[4]arene amino acid

Solid-phase synthesis is used to obtain new linear and cyclic N,C-linked peptidocalixarenes. The synthetic strategy allows, for the first time, the condensation of a calix[4]arene amino acid during the stepwise elongation sequence of the peptide. An important role is played by the lower rim functionalization of the calixarene since it modulates the flexibility of the calixarene scaffold and the conformational properties of the resulting non-natural peptide.