Document Report Card

ID: ALA1127018

Journal: J Med Chem

Title: Synthesis and biological activity of spirocyclic benzopyran imidazolone potassium channel openers.

Authors: Gadwood RC, Kamdar BV, Dubray LA, Wolfe ML, Smith MP, Watt W, Mizsak SA, Groppi VE.

Abstract: A series of novel spirocyclic benzopyran imidazolones were synthesized as rigid analogues of cromakalim. These compounds cause a dose-dependent membrane hyperpolarization of A10 rat aorta cells. This hyperpolarization was blocked by pretreatment with glyburide, indicating that the spirocyclic benzopyran imidazolones were acting by increasing the open probability of ATP-sensitive potassium channels in A10 cells. Representative compounds also showed potent in vivo activity as hypotensive agents in normotensive rats. Many of the compounds described are much more potent than cromakalim both in vitro and in vivo, with one of the most potent compounds being 2,3-dihydro-2,2-dimethyl-6-nitro-2'-(propylamino)spiro[4H-1-benzopyran- 4,4'-[4H]imidazol]-5'(1'H)-one (5r). It is concluded that the N1' nitrogen of the imidazolone is an effective substitute for the carbonyl oxygen of cromakalim. The rigid spirocyclic ring fusion holds this nitrogen in an optimum orientation relative to the benzopyran ring.

CiteXplore: 8496916

DOI: 10.1021/jm00062a022