title: Structure-activity relationships of polycyclic aromatic amines with calcium channel blocking activity.
abstract: 8-Benzylamino-8, 11-oxapentacyclo[5.4.0.0(2,6).0(3,10).0(5,9)]undecane (1) inhibits the calcium current in L-type calcium channels. A series of nitrobenzylamines (2, 3, 4), methoxybenzylamines (5, 6, 7), methylpyridines (8, 9, 10), and a phenylhydrazine derivative (11) of 8,11-oxapentacyclo[5.4.0.0(2,6).0(3,10).0(5,9)]undecane was synthesized. By substituting the 8,11-oxapentacyclo-[5.4.0.0(2,6).0(3,10).0(5,9)]undecane skeleton with 3-hydroxyhexacyclo-[6.5.0.0(3,7).0(4,12).0(5,10).0(9,13)]tridec ane (12), 8,13-dioxapentacyclo[6.5.0.0(2,6).0(5,10).0(3,11)]tridecane- 9-one (13), and pentacyclo-[5.4.0.0(2,6).0(3,10).0(5,9)]undecane (14), the effect of the polycyclic skeleton could also be investigated. Increased inhibition of calcium current was observed with aromatic substitution (especially ortho and meta substitution) in the pentacycloundecane series. The calcium channel activities of the methoxy compounds were slightly higher than those of the corresponding nitro compounds while a definite decrease in activity was observed for the phenylhydrazine and aminomethylpyridine derivatives. Increased inhibition of the calcium current was also observed for structures in which the polycyclic 'cages' were enlarged. Structure-activity relationships in this series of compounds therefore appear to be dominated by geometric or steric constraints.
authors.affiliation: Potchefstroom University for Christian Higher Education, Potchefstroom, South Africa.
authors.forename: S F
authors.initials: SF
authors.lastname: Malan
authors.forename: J J
authors.initials: JJ
authors.lastname: Van der Walt
authors.forename: C J
authors.initials: CJ
authors.lastname: Van der Schyf
mesh_terms: D000818:Animals; D002121:Calcium Channel Blockers / Q000138:chemical synthesis / Q000494:pharmacology*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D006168:Guinea Pigs; D006321:Heart / Q000187:drug effects; D066298:In Vitro Techniques; D009206:Myocardium / Q000166:cytology / Q000378:metabolism; D018408:Patch-Clamp Techniques; D011084:Polycyclic Aromatic Hydrocarbons / Q000138:chemical synthesis / Q000494:pharmacology*; D013329:Structure-Activity Relationship
chemical_list: D002121:Calcium Channel Blockers; D011084:Polycyclic Aromatic Hydrocarbons