2,4-Diamino-6,7-dimethoxyquinazolines. 1. 2-[4-(1,4-Benzodioxan-2-ylcarbonyl)piperazin-1-yl] derivatives as .alpha.1-adrenoceptor antagonists and antihypertensive agents
摘要:
A series of 4-amino-2-[4-(1,4-benzodioxan-2-ylcarbonyl)piperazin-1 -yl]-6, 7-dimethoxyquinazoline derivatives was synthesized for evaluation as alpha-antagonists and antihypertensive agents. Most compounds displayed high (nM) binding affinity for alpha 1-adrenoceptors with no significant activity at alpha 2-sites. Selective antagonism of the alpha 1-mediated vasoconstrictor effects of norepinephrine is also characteristic of the series. Structure-activity relationships for alpha 1-adrenoceptor affinity are presented, and structural similarity between the 2,4-diamino-6,7-dimethoxyquinazoline nucleus and norepinephrine is established. An alpha 1-receptor model is presented in which charge-reinforced hydrogen bonding is important for binding of both antagonist and agonist molecules. Antihypertensive activity was evaluated after oral administration (5 mg/kg) to spontaneously hypertensive rats, and several compounds displayed similar efficacy to prazosin when assessed after 6 h. On the basis of alpha 1-adrenoceptor affinity/selectivity in vitro and duration of antihypertensive action in vivo, compound 1 (doxazosin) was selected for further evaluation and is currently progressing through phase III clinical trials.
The Friedel-Crafts acylation of 2-substituted-1,4-benzodioxin derivatives provides regioselectively the 6-acyl compounds. The same reaction with the saturated analogs affords two regioisomers with the 7-acyl compounds as the main products.
Compounds having the formula ##STR1## and pharmaceutically acceptable salts thereof wherein R represents 6,7-di(lower alkoxy) or 6,7,8-tri(lower alkoxy); m is 1 or 2, X is --CHR.sup.1 -- or --CH.sub.2 CH.sub.2 --; each R.sup.1 and R.sup.0 may be the same or different and is hydrogen or lower alkyl; each of R.sup.2 and R.sup.3 is hydrogen, lower alkoxy, lower alkyl, halogen, lower alkanoyl, lower alkoxycarbonyl, --CONR.sup.4 R.sup.5 or --SO.sub.2 NR.sup.4 R.sup.5 wherein each of R.sup.4 and R.sup.5 is hydrogen or lower alkyl; processes for their preparation; and their use as regulators of the cardiovascular system, and particularly in the treatment of hypertension.
Benzodioxines substituées, leur procédé de préparation et les compositions pharmaceutiques les contenant
申请人:ADIR ET COMPAGNIE
公开号:EP0624582A1
公开(公告)日:1994-11-17
Composés de formule générale (I) :
dans laquelle :
X représente O, S ou H₂,
R et R' représentent chacun l'hydrogène, ou forment ensemble une liaison,
R₁, R₂, R₃ et R₄ sont tels que définis dans la description,
Ces composés trouvent leur application en thérapeutique dans le traitement ou la prévention des affections où interviennent des processus oxydatifs.
通式(I)化合物:
其中
X 代表 O、S 或 H₂、
R 和 R'各自代表氢,或共同形成一个键、
R₁、R₂、R₃ 和 R₄ 如说明中所定义、
这些化合物可用于治疗或预防涉及氧化过程的疾病。