Abstract
Sets of isomeric thiazole derivatives 1 and 2 have been synthesised in a parallel iterative solution-phase synthesis approach guided by the SAR analysis derived from biological results and computer-aided design and analysis. This synergistic and streamlined working procedure led to highly active isomeric NPY5 receptor ligands. However, a 10-fold difference at least in their respective binding affinities was consistently found for all isomeric pairs 1 and 2. The analysis of conformational differences due to heteroatom interactions in 1 and 2 revealed a favourable C O⋯S interaction in 1, whereas thiazoles 2 showed a repulsive C O⋯N interaction.
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