Structure-Activity Relationship Studies of Central Nervous System Agents. 13.4-[3-(Benzotriazol-1-yl)propyl]-1-(2-methoxyphenyl)piperazine, a New Putative 5-HT1A Receptor Antagonist, and Its Analogs

Abstract
A new set of 4-alkyl-1-(o-methoxyphenyl)piperazines containing a terminal benzotriazole fragment were synthesized, and their 5-HT1A and 5-HT2 affinity was determined. It was shown that the benzotriazole moiety contributes to both the 5-HT1A and 5-HT2 receptor affinity. It was demonstrated in several behavioral models that 4-[3-(benzotriazol-1- yl)propyl]-1-(2-methoxyphenyl)piperazine (11) is a new, potent presynaptic and postsynaptic 5-HT1A receptor antagonist. However, it is not selective for 5-HT1A versus alpha 1 receptors.

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