Synthesis and quantitative structure-activity relationship of a novel series of small conductance Ca(2+)-activated K+ channel blockers related to dequalinium.
J Med Chem
; 39(2): 359-70, 1996 Jan 19.
Article
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| MEDLINE
| ID: mdl-8558503
ABSTRACT
The synthesis, pharmacological testing, and quantitative structure-activity relationship studies of a novel series of bisquinolinium small conductance Ca(2+)-activated K+ channel blockers (23) related to dequalinium are described. In this series, two quinolinium rings are linked via the 4-position to an alpha, omega-diamino alkylene chain and the ring N atom is quaternized with a methyl or benzyl group. The exocyclic N atom can be replaced by O, S, or CH2 but with some loss of potency. The quinoline groups do not have to be quaternized for blocking activity, as long as they are basic enough to be protonated at the site of action. For the quaternary compounds, there is considerable steric tolerance for the group R attached to the ring N atom of the quinoline; a benzyl group gave the optimum potency in this series. Moreover, and in contrast to previously reported results for dequalinium analogues, there is no correlation of activity to previously reported results for dequalinium analogues, there is no correlation of activity with N1 charge or EHOMO. On the other hand, a good correlation was obtained between the blocking potency of the compounds and ELUMO [pEMR = 1.16(+/-0.26)ELUMO + 5.33(+/-01.29)(n = 11, r= 0.83, s = 0.243)]. It has been possible to combine this equation with the previously reported ELUMO correlation for a series of dequalinium analogues to include all the compounds of both series [pEMR = 1.17(+/-0.15)ELUMO +5.33(+/-0.76)(n =24, r = 0.85, s = 0.249)]. A possible physical meaning for the ELUMO correlation based upon the principle of maximum hardness is discussed.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Calcio
/
Bloqueadores de los Canales de Potasio
/
Decualinio
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Revista:
J Med Chem
Asunto de la revista:
QUIMICA
Año:
1996
Tipo del documento:
Article
País de afiliación:
Reino Unido