Peptoids (N-substituted glycine oligomers) are an increasingly important class of peptidomimetic foldamers with conspicuous bioactivities, high degree of resistance to enzymatic degradation, and ability to form stable secondary structures. The intrinsic rigidity of their oligoamide framework (due to n→π*, side chains NC α -H···O=C n→σ*, and backbone C α -H···O=C interactions), can be magnified by cyclization to afford macrocyclic species with unexpected stereochemical, topo- [a] 2982 Scheme 1. "Sub-monomer" method for (cyclo)peptoid synthesis.
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