This work approaches these principles in three topics and for different purposes. The first chapter presents a novel scanning strategy which utilizes synthetic local rigidifications for the evaluation of Neuropeptide Y structure and receptor binding patterns. The fundamental process of macrocyclization is topic of the second chapter. For iminopeptides, ring-chain equilibria can be established and controlled, thereby allowing for the thermodynamic analysis of the ring closure. This leads to the identification of structural determinants that influence the inclination of a peptide chain to close the ring. In the third chapter, a sugarbased synthetic pathway leading to highly functionalized thiazole dipeptides is described. This strategy led to the synthesis of core motivs of complex thiopeptide antibiotics, as well as to diastereomers and homologs thereof.
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