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Studies on Antihypertensive Agents with Antithrombotic Activity. 2. Syntheses and Pharmacological Evaluation of Pyrrolo[2,3-c]azepine Derivatives.
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2000
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Hypertension-Receptor AntagonistsCardiovascular PharmacologyPharmacotherapyPharmaceutical ChemistryMedicinal ChemistrySerotonin 2Antithrombotic ActivityBiochemistryAntihypertensive AgentsAntihypertensive TherapyMechanism Of ActionPharmacological AgentPharmacologyNatural SciencesDeoxycorticosterone AcetatePharmacological EvaluationMedicineDrug Discovery
As an extension of our previous investigation, a series of 7-aminoalkylpyrrolo[2,3-c]azepine derivatives was synthesized and evaluated as alpha1-adrenergic- and serotonin 2 (5-HT2)-receptor antagonists, with the aim of finding a novel potent antihypertensive agent with both activities. Among the compounds obtained in this study, (E)-1-ethyl-7-[3-[4-(4-fluorophenyl)piperazin-1-yl]propyl]-4-hy droxyimino-1,4,5,6,7,8-hexahydropyrrolo[2,3-c]azepin-8-on e (16d) displayed potent alpha1-adrenoceptor blocking activity (pA2=7.83+/-0.20) and 5-HT2-receptor blocking activity (pA2=9.47+/-0.17) in isolated guinea pig arteries. At 3 mg/kg oral administration, compound 16d exhibited antihypertensive activity more potent than that of doxazosin in deoxycorticosterone acetate (DOCA)-salt hypertensive dogs. Furthermore, this compound reduced the rate of mouse acute pulmonary thromboembolytic death induced by collagen and serotonin at oral doses of 0.3 mg/kg or more, and its effect lasted for at least 6 h at 3 mg/kg.