Conformational Preferences of Chiral Acyclic Homooligomeric β2,2-Peptides

α-Methylisoserine, a chiral acyclic quaternary β-amino acid, has been used to mimic secondary structures, when it is incorporated in a homogeneous β2,2-dipeptide. In particular, the observed folded conformations in aqueous solution can be regarded as mimics of β-turn.