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Our initial findings around aryl sulfonamide series led to N-(3,5-dichloro-2-methoxyphenyl)-3-(1-methylpiperidin-4-ylamino)-4-methoxy benzenesulfonamide as potent and selective 5-HT(6) receptor (5-HT(6)R) antagonist with reasonable pharmacokinetic properties and activity in animal models of cognition. However, lack of brain penetration and P-glycoprotein liability makes this scaffold unsuitable for further development. Our goal was to identify small molecule 5-HT(6)R antagonist with adequate brain penetration, acceptable ADME properties, no P-glycoprotein, and no hERG liability. Several structural modifications including bringing conformational constraint around the sulfonamide -NH group and introduction of a heteroatom to modulate the physicochemical properties were attempted. This effort culminated in the discovery of series of novel, potent, selective, orally bioavailable, and adequately brain penetrant compounds with no hERG liability. These compounds showed activity in animal models of cognition like object recognition task and water maze and in brain microdialysis studies at lower doses.

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A series of N 0 -[3-(indole-1-sulfonyl) aryl]-N,N-dimethyl ethane-1,2-diamines and N 0 -[3-(indole-1-sulfonyl) aryl]-N,N-dimethyl propane-1,3-diamines was designed and synthesized as 5-HT 6 receptor ligands. These compounds, when screened in a functional reporter gene-based assay, displayed potent antagonistic activity with K b values in the range of 1.8-60 nM. The lead compound 9y has shown good ADME surrogate properties, acceptable pharmacokinetic profile and is active in animal models of cognition like novel object recognition test and Morris water maze. It was selected for detailed profiling.