title: Heterocyclic analogs of benzanilide derivatives as potassium channel activators. IX.
abstract: On the basis of our previous works, addressed to synthesise new activators of BK potassium channels, and of many suggestions from the international literature, a simple pharmacophoric model, consisting of two suitably substituted phenyl rings bound to various kinds of linkers, was hypothesised. In particular, the effectiveness of the amidic linker was demonstrated, since several benzanilide derivatives showed interesting BK-opener properties. As a development of these benzanilides, in this work we introduced heterocyclic substituents, replacing the aryl ring on the acid side or on the basic one of the amide linker of the above pharmacophore. The pharmacological results indicated some relevant remarks about the structural requirements, needed for a satisfactory BK-opener activity. In particular, the presence of a phenolic function, with a possible H-bond donor role, has been confirmed. Furthermore, the presence of nitrogen heterocycles on the acid side of the amide linker seems to be a negative requirement, while furan and thiophene were well tolerated. On the contrary, the introduction of insaturated heterocyclic rings (pyridine and thiazole) on the basic side of the amide linker, led to satisfactory biological activity, while the presence of aliphatic heterocycles lowered the pharmacological effect.
authors.affiliation: Dipartimento di Psichiatria, Neurobiologia, Farmacologia e Biotecnologie, Università di Pisa, via Bonanno 6, I-56126 Pisa, Italy. calderone@farm.unipi.it
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Calderone
authors.forename: Francesca Lidia
authors.initials: FL
authors.lastname: Fiamingo
authors.forename: Irene
authors.initials: I
authors.lastname: Giorgi
authors.forename: Michele
authors.initials: M
authors.lastname: Leonardi
authors.forename: Oreste
authors.initials: O
authors.lastname: Livi
authors.forename: Alma
authors.initials: A
authors.lastname: Martelli
authors.forename: Enrica
authors.initials: E
authors.lastname: Martinotti
mesh_terms: D008401:Gas Chromatography-Mass Spectrometry; D006571:Heterocyclic Compounds / Q000737:chemistry / Q000494:pharmacology*; D006860:Hydrogen Bonding; D015221:Potassium Channels / Q000819:agonists*; D013055:Spectrophotometry, Infrared; D014665:Vasodilator Agents / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D006571:Heterocyclic Compounds; D015221:Potassium Channels; D014665:Vasodilator Agents