Pyrroloquinoline scaffold-based 5-HT6R ligands: synthesis, quantum chemical and molecular dynamic studies, and influence of nitrogen atom position in the scaffold on affinity

Publication date: Available online 23 May 2018
Source:Bioorganic & Medicinal Chemistry
Author(s): Katarzyna Grychowska, Rafał Kurczab, Paweł Śliwa, Grzegorz Satała, Krzysztof Dubiel, Mikołaj Matłoka, Rafał Moszczyński-Pętkowski, Jerzy Pieczykolan, Andrzej J. Bojarski, Paweł Zajdel
Based on pyrroloquinoline scaffold bearing 5-HT2C agonists, a series of arylsulfonamide derivatives of 1H-pyrrolo[2,3-f]quinoline and 1H-pyrrolo[3,2-h]quinoline, substituted at position 3 with tetrahydropyridine, were synthesized and evaluated in vitro for their affinity for 5-HT6 receptors. A structure–activity relationship study showed that the 1H-pyrrolo[3,2-h]quinoline scaffold was more favorable for 5-HT6R binding than the 1H-pyrrolo[2,3-f]quinoline one, suggesting dependence upon the type of condensation of the pyrrole and quinoline rings. As revealed by quantum-chemical calculations and molecular dynamic studies, position of the quinoline nitrogen atom in the planar pyrroloquinoline skeleton might affect the spatial orientation of the arylsulfonyl fragment, as a result of structure stabilization by internal hydrogen bonds.

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