Design and Synthesis of Diastereomeric β3-Peptides from (R,R)/(S,S)-APyC and (R)/(S)-β3-Caa: Determination of Enantiomeric Handedness

Cooperative 5- and 10-membered ring interactions in the 10-helix folding of oxetin homo-oligomers

Homo-oligomers of the natural product oxetin (cis-3-amino-2-oxetanecarboxylic acid) were prepared and their conformational behaviour studied in solution and solid state and by molecular modelling. The predominant secondary structure was a 10-helix, propiciously stabilized by a network of 5-membered ring H-bonds implicating ring oxygens and neighboring amide hydrogen atoms.