β2,3‐Cyclic Aminoxy Acids: Rigid and Ring‐Size‐Independent Building Blocks of Foldamers

Independent of the ring size in the aliphatic side chains, peptides made up of β2,3-cyclic aminoxy acids, novel chiral building blocks of foldamers, adopt uniform secondary structures consisting of rigid β NO turns and 1.89-helix structures (see figure). This contrasts previous results from other groups with cyclic ring-constrained β-peptides.