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Updated: Feb 19, 2026

Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine
Published on: June 13, 2022
Optimization of N'-(arylsulfonyl)pyrazoline-1-carboxamidines by exploiting a novel interaction site in the 5-HT6
Arnold van Loevezijn1, Jennifer Venhorst1, Wouter I Iwema Bakker1
1Abbott Healthcare Products B.V. (Formerly Solvay Pharmaceuticals B.V.), C.J. van Houtenlaan 36, 1381 CP Weesp, The Netherlands.
Abstract:
The discovery of non-basic N'-(arylsulfonyl)pyrazoline-1-carboxamidines as 5-HT6 antagonists with unique structural features was recently disclosed. Here we describe how this structural class was further developed by addressing an unexplored interaction site of the 5-HT6 receptor. Compound 13 resulting from this effort is a highly potent and selective 5-HT6 antagonist with improved metabolic stability. It is furthermore devoid of hERG affinity. Despite its modest CNS/plasma ratio, a high brain free fraction ensured substantial exposure to allow for rodent cognition studies.
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