Journal of Medicinal Chemistry p. 895 - 903 (1992)
Update date:2022-08-03
Topics:
Youssefyeh
Campbell
Klein
Airey
Darkes
Powers
Schnapper
Neuenschwander
Fitzpatrick
Pendley
Martin
This report describes the development of novel benzamides which are orally active, highly potent, specific antagonists of 5-HT3 receptors. Described in this first report are the structure-activity relationships that led to novel structures with improved potency and selectivity. From this series of compounds, (S)-28 was identified and selected for further evaluation as a 5- HT3 receptor antagonist. Compared with 5-HT3 antagonists such as GR 38032F, BRL 43694, and metoclopramide, (S)-28 was most active in (a) inhibiting binding to 5-HT3 receptor binding sites in rat entorhinal cortex with an K(i) value of 0.19 nM and (b) blocking cisplatin-induced emesis in the ferret with an ED50 value determined to be 9 μg/kg po.
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