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Antispasmodic activity of xanthoxyline derivatives: structure-activity relationships
V Cechinel Filho1, O G Miguel, R J Nunes
1Departamento de Química, Universidade Federal de Santa Catarina, Brazil.
Journal of Pharmaceutical Sciences
|April 1, 1995
Summary
Xanthoxyline derivatives show potent antispasmodic effects, particularly acetophenones with methoxyl groups. Structural modifications, like adding benzyl groups, significantly enhance this activity, offering potential new treatments for spasms.
Area of Science:
- Pharmacology
- Medicinal Chemistry
- Natural Product Derivatives
Background:
- Xanthoxyline is a natural compound with potential pharmacological activities.
- Understanding structure-activity relationships is crucial for developing effective therapeutic agents.
- Acetylcholine-induced contractions in smooth muscle are a common model for evaluating antispasmodic potential.
Purpose of the Study:
- To evaluate the in vitro antispasmodic activity of novel xanthoxyline derivatives.
- To identify key structural features responsible for antispasmodic efficacy.
- To explore modifications that enhance the potency of xanthoxyline derivatives.
Main Methods:
- In vitro evaluation of antispasmodic activity using acetylcholine-induced guinea pig ileum contractions.
- Synthesis and structural modification of xanthoxyline derivatives, including alterations to hydroxyl, carbonyl, and aromatic ring substituents.
- Comparative analysis of the antispasmodic potency of synthesized compounds against xanthoxyline and papaverine.
Main Results:
- Acetophenones with 3,4-dimethoxy substitution exhibited significant antispasmodic activity.
- Introduction of benzyl or p-methoxybenzyl groups at the hydroxyl position increased potency 4-8 fold; methyl substitution caused contractant effects.
- Chalcones formed by condensation with benzaldehydes were approximately 5-fold more potent than xanthoxyline; methoxyl and carbonyl groups are critical.
Conclusions:
- Methoxyl and carbonyl groups are essential for the antispasmodic activity of xanthoxyline derivatives.
- Hydroxyl group modification, particularly with benzyl or p-methoxybenzyl groups, significantly enhances antispasmodic action.
- Xanthoxyline derivatives, especially modified chalcones and benzyl ethers, represent promising candidates for antispasmodic drug development.