Structure–activity studies for a novel series of tricyclic dihydropyridopyrazolones and dihydropyridoisoxazolones as KATP channel openers
摘要:
In search of a novel chemotype of KATP channel openers a series of tricyclic dihydropyridopyrazolones and dihydropyridoisoxazolones was synthesized. It was found that cyclopentanone in the left hand portion of the molecule was 4-fold more potent than cyclohexanone. Introduction of gem-dimethyl groups as well as incorporation of oxygen in the cyclohexanone ring in the left hand portion of the molecule increased the potency 10-fold. In the right hand portion of the molecule, the NH-group of the pyrazolone can be effectively substituted by oxygen increasing the activity 5-fold. Incorporation of a methyl group adjacent to the dihydropyridine (DHP) nitrogen not only significantly boosted activity, but also provided an additional benefit of increased metabolic stability. In vitro tests on the tissue from pig bladder strips provided further confirmation of K-ATP activity of these compounds. (C) 2004 Elsevier Ltd. All rights reserved.
Tricyclic dihydropyrazolone and tricyclic dihydroisoxazolone potassium channel openers
申请人:——
公开号:US20020007059A1
公开(公告)日:2002-01-17
Compounds of formula I
1
are useful in treating diseases prevented by or ameliorated with potassium channel openers. Also disclosed are potassium channel opening compositions and a method of opening potassium channels in a mammal.