Parallel synthesis of a small library of hydroxy functionalized bicyclic lactams with optically pure mimicking dipeptide Pro-Ser has been accomplished via aldol condensation of aldehyde 9 with N-BocGlyCO2Et. The configurations of eight scaffolds were established unambiguously by NMR spectroscopy.
In an effort to design dipeptide structural mimics of protein and peptide reverse-turns, a series of 5,5-, 6,5-, and 7,5-fused 2-oxo-1-azabicycloalkane aminoacids has been synthesized. A new and convenient synthetic route utilizing a Horner−Emmons reaction followed by double-bond reduction has been used to prepare the bicyclic lactams in high yields.