Cyclic Peptoids as Topological Templates: Synthesis via Central to Conformational Chirality Induction

Chiral induction was utilized for the synthesis of diastereopure cyclic peptoids containing an N-benzyl alanine residue. Molecular modeling, NMR spectroscopy, single-crystal X-ray diffraction studies, and HPLC with chiral stationary phase demonstrated easy formation of free and sodium/benzylammonium complexed cyclic oligomers through strategic incorporation of a single stereogenic center in the oligomeric backbone. The synthesis of cyclic peptoids with defined conformational chirality and appropriate side chain topology is now possible.