Novel benzazole derivatives bearing a (imidazolidin-2-yl)imino moiety at position I or 2 were synthesized by reacting 1-amino- or 2-aminobenzazoles with N,N'-bis(tert-butoxycarbonyl)imidazolidine-2-thione in the presence of HgCl2. Structures of 1-[(imidazolidin-2-yl)imino]indazole (marsanidine, 13a) and free base of the 4-Cl derivative 12e were confirmed by X-ray single crystal structure analysis. Compound 13a was found to be the selective alpha(2)-adrenoceptor ligand with alpha(2)-adrenoceptor/imidazoline I-1 receptor selectivity ratio of 3879, while 1-[(imidazolidin-2-yl)imino]-7-methylindazole (13k) proved to be a mixed alpha(2)-adrenoceptor/imidazoline I-1 receptor agonist with alpha 2/I-1 selectivity ratio of 7.2. Compound 13k when administered intravenously to male Wistar rats induced a dose-dependent decrease in mean arterial blood pressure (ED50 = 0.6 mu g/kg) and heart rate, which was attenuated following pretreatment with alpha(2A)-adrenoceptor antagonist RX821002. Compound 13a may find a variety of medical uses ascribed to alpha(2)-adrenoceptor agonists, and its 7-methyl derivative 13k is a good candidate for development as a centrally acting antihypertensive drug.
[EN] DERIVATIVES OF 1-[(IMIDAZOLIDIN-2-YL)IMINO)]INDAZOLE<br/>[FR] DÉRIVÉS DU 1-[(IMIDAZOLIDIN-2-YL)IMINO)]INDAZOLE
申请人:IMP INNOVATIONS LTD
公开号:WO2009071906A1
公开(公告)日:2009-06-11
The invention provides a compound of formula (I) wherein R1 denotes hydrogen, methyl or phenyl; R2, R3, R4 and R5 denote hydrogen, halogen, preferably a chlorine atom, alkyl, preferably methyl, alkoxyl, preferably methoxyl; m denotes a number 0 or 1; and HX denotes sulfuric, phosphoric, acetic, malonic, fumaric, oxalic, lactic, tartaric, citric, gluconic, p-toluenesulfonic, methanesulfonic acid, hydrogen bromide or hydrogen iodide, preferably hydrogen chloride. The use of the compounds as α2-adrenergic receptor agonists is also provided.
作者:Franciszek Sa̧czewski、Anita Kornicka、Apolonia Rybczyńska、Alan L. Hudson、Shu Sean Miao、Maria Gdaniec、Konrad Boblewski、Artur Lehmann
DOI:10.1021/jm800112s
日期:2008.6.1
Novel benzazole derivatives bearing a (imidazolidin-2-yl)imino moiety at position I or 2 were synthesized by reacting 1-amino- or 2-aminobenzazoles with N,N'-bis(tert-butoxycarbonyl)imidazolidine-2-thione in the presence of HgCl2. Structures of 1-[(imidazolidin-2-yl)imino]indazole (marsanidine, 13a) and free base of the 4-Cl derivative 12e were confirmed by X-ray single crystal structure analysis. Compound 13a was found to be the selective alpha(2)-adrenoceptor ligand with alpha(2)-adrenoceptor/imidazoline I-1 receptor selectivity ratio of 3879, while 1-[(imidazolidin-2-yl)imino]-7-methylindazole (13k) proved to be a mixed alpha(2)-adrenoceptor/imidazoline I-1 receptor agonist with alpha 2/I-1 selectivity ratio of 7.2. Compound 13k when administered intravenously to male Wistar rats induced a dose-dependent decrease in mean arterial blood pressure (ED50 = 0.6 mu g/kg) and heart rate, which was attenuated following pretreatment with alpha(2A)-adrenoceptor antagonist RX821002. Compound 13a may find a variety of medical uses ascribed to alpha(2)-adrenoceptor agonists, and its 7-methyl derivative 13k is a good candidate for development as a centrally acting antihypertensive drug.