Abstract
A series of terfenadine derivatives were evaluated for enantioselectivity on histamine H1-receptors and calcium channels. Whereas H1-receptors are only sterically discriminative against the benzhydryl part of the molecules, calcium channels showed enantioselectivity to either the phenylbutyl part or the benzhydryl part provided that an appropriate lipophilicity is preserved at the chiral site. It is speculated that the hydrophilicity of the butanol moiety is responsible for the lack of stereoselectivity of terfenadine enantiomers since it drives the side chain out the stereoselective site of calcium channels, which are lipophilic. In four different test systems, (guinea-pig ileum, guinea-pig lung membranes, rat aorta and rat cortex mebranes), this series of compounds generally showed about 10 times higher activity on H1-receptors than on calcium channels. By introducing a chiral center in the different parts of the molecule we were able to increase the selectivity of an enantiomer VUF4648 to calcium channels.
Similar content being viewed by others
References
H. C. Masheter,Terfenadine: the first nonsedating antihistamine. Clin. Rev. Allergy11, 5–34 (1993).
M.-Q. Zhang, P. Caldirola and H. Timmerman,Calcium antagonism and structure-activity relationships of terfenadine, a histamine H 1 antagonist, and some related compounds. J. Pharm. Pharmacol.45, 63–66 (1993).
M.-Q. Zhang, A. M. ter Laak and H. Timmerman,Structure-activity relationships within a series of analogues of histamine H 1-antagonist terfenadine. Eur. J. Med. Chem.28, 165–173 (1993).
M.-Q. Zhang, P. Caldirola, D. C. Leysen and H. Timmerman,Novel stereoselective calcium channel ligands of the diphenylalkylamine-type. Bioorg. Med. Chem. Lett.2, 1283–1288 (1992).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Zhang, M.Q., Caldirola, P. & Timmerman, H. Chiral manipulation of drug selectivity: Studies on a series of terfenadine-derived dual antagonists on H1-receptors and calcium channels. Agents and Actions 41 (Suppl 1), C140–C142 (1994). https://doi.org/10.1007/BF02007802
Issue Date:
DOI: https://doi.org/10.1007/BF02007802