Novel 2-Amino-1,4-dihydropyridine Calcium Antagonists. II. Synthesis and Antihypertensive Effects of 2-Amino-1,4-dihydropyridine Derivatives Having N,N-Dialkylaminoalkoxycarbonyl Groups at 3- and/or 5-Position.
potency than those with acyclic amino moieties. Chemical modification studies indicated that the two ester side-chains of 1,4-dihydropyridine at the 3- and 5-position might function in a different manner in relation to the antihypertensive activities. 3-(1-Benzhydrylazetidinited potent and long-lasting antihypertensive effects with gradual onset of action, and is a promising candidate as an antihypertensive
Azelnidipine (1), dihydropyridine-based calcium antagonists (DHPs) are one of the widely used drugs for treatment of hypertension. During the laboratory optimization and later during its bulk synthesis the formation of various impurities was observed. The impurities formed were monitored and their structures were tentatively assigned on the basis of their fragmentation patterns in LC-MS. Most of the impurities were synthesized and their assigned constitutions confirmed by co-injection in HPLC. We describe herein the formation, synthesis and characterization of these impurities. Our study will be of immense help to others to obtain chemically high pure azelnidipine.
Dihydropyridine derivatives, their preparation and their use
申请人:Sankyo Company Limited
公开号:US04772596A1
公开(公告)日:1988-09-20
2-(Amino or methyl)-6-(methyl or amino)-4-(substituted phenyl)-1,4-dihydropyridine-3,5-dicarboxylic acid esters have a specific class of heterocyclic groups as thealcohol moiety. These compounds have a variety of valuable activities, including antihypertensive and Ca.sup.++ -blocking activities, leading to their use for the treatment of circulatory and coronary disorders. They may be prepared by condensation of appropriate substituted benzylideneacetoacetic acid esters with appropriate amidinoacetic acid esters.