Selectivity profiling of novel indene H(1)-antihistamines for the treatment of insomnia

A series of indene analogs of the H(1)-antihistamine (-)-R-dimethindene was evaluated for selectivity in the search for potentially improved sedative-hypnotics. Variation of the 6-substitutent in the indene core in combination with a pendant electron rich heterocycle led to the identification of several potent H(1)-antihistamines with desirable selectivity over CYP enzymes, the M(1) muscarinic receptor and the hERG channel. These compounds were candidates for further ADME profiling and in vivo evaluation.