CAS: 88150-47-4; 3-Ethyl 5-Methyl 2-((2-Aminoethoxy)Methyl)-4-(2-Chlorophenyl)-6-Methyl-1,4-Dihydropyridine-3,5-Dicarboxylate Maleate

上下游产品

CAS号88150-42-9 氨氯地平 | CAS号110-16-7 马来酸 | CAS号88150-46-3 3-O-ethyl 5-O-m... | CAS号88150-62-3 邻苯二甲酰基氨氯地平

专利信息

专利号:WO-2004058711-A1
优先权日:2002-12-30
标 题 :Isolation of dihydropyridine derivative and preparation salts thereof
发明人：ASLAN TUNCER; ADIYAMAN MUSTAFA; YURDAKUL AYCIL; SAHPAZ FILIZ; OZARSLAN EVREN A; GUNER DIDEM; RIDVANOGLU NURTEN
权利人:EOS ECZACIBASI OZGUN KIMYASAL; ASLAN TUNCER; ADIYAMAN MUSTAFA; YURDAKUL AYCIL; SAHPAZ FILIZ; OZARSLAN EVREN A; GUNER DIDEM; RIDVANOGLU NURTEN
摘要:The title compound is isolated in pure form by using a crystallization process and converted to its pharmaceutically acceptable salts. The crystallization process affects stability and purity of the amlodipine salts. All known impurities and one unknown impurity, which forms during the synthesis of the amlodipine salts, were isolated, characterized, and synthesized. A new method allowing the quantitative HPLC analysis of all related impurities of amlodipine salts in a single chromatogram was developed.

专利号:WO-9925689-A1
优先权日:1997-11-14
标题 :Process for the preparation of acetal derivatives of 1,4-dihydropyridines
发明人：KARUP GUNNAR LEO; PREIKSCHAT HERBERT FRITZ; PEDERSEN SOEREN BOLS
权利人:GEA FARMACEUTISK FABRIK AS; KARUP GUNNAR LEO; PREIKSCHAT HERBERT FRITZ; PEDERSEN SOEREN BOLS
摘要:A process for the preparation of 1,4-dihydropyridine acetal derivatives of formula (II) wherein R1 each, independently, represents H, Cl or CF¿3; R?2 represents H, C¿1?-C5 alkyl, C3-C6 cycloalkyl or aralkyl; R?3 and R4¿ which may be the same or different, represent C¿1?-C5 alkyl, C3-C6 cycloalkyl, aralkyl or together represent -(CH2)m-, wherein m is 2 or 3, and n is 1 or 2, wherein the 1,4-dihydropyridine ring structure is formed by a Hantzsch synthesis carried out in one or more steps using a compound containing a group of formula (a); wherein R?3 and R4¿ have the same meanings as defined above, as one of the reactants in the Hantzsch condensation, is described. The Hantzsch synthesis, or at least one step thereof, is carried out in a solvent, which is capable of forming an azeotrope with water, under azeotropic removal of water of reaction. The compounds of formula (II) are useful as intermediates for the preparation of pharmaceutically active 1,4-dihydropyridines and other intermediates of use for such purpose.

专利号:CN-108358833-A
优先权日:2018-03-15
标题:A kind of synthesis technique of amlodipine maleate