[EN] A NOVEL PROCESS FOR PREPARATION OF NEBIVOLOL INTERMEDIATES<br/>[FR] PROCESSUS NOVATEUR DE PRÉPARATION D'INTERMÉDIAIRES DU NÉBIVOLOL
申请人:HETERO DRUGS LTD
公开号:WO2006016376A1
公开(公告)日:2006-02-16
The present invention relates to a process for separation of desired diastereomeric pair from a mixture of diastereomeric pairs thereby obtaining nebivolol intermediates. Thus, the mixture of (+)-[1S*(R*)]-6-fluoro-3,4-dihydro-α-[[(phenylmethyl)amino]methyl]-2H-1-benzopyran-2-methanol, (+)-[1S*(S*)]-6-fluoro-3,4-dihydro-2-oxiranyl-2H-1-benzopyran and ethanol is heated to reflux temperature and stirred for 8 hours at the same temperature to obtain (+)-[2R*[1S*,5S*(S*)]]+[2R*[1S*,5R*(R*)]]-α,α'-[phenylmethyliminobis(methylene)]bis[6-fluoro-3,4-dihydro-2H-1-benzopyran-2-methanol]. Then the reaction mass is cooled to 10ºC, the pH is adjusted to 2 with HCl gas and stirred for 45 minutes at 25ºC to 30ºC. Then the separated solid is filtered and dried to give (+)-[2R*[1S*,5S*(S*)]]-α,α'-[phenylmethyliminobis(methylene)]bis[6-fluoro-3,4-dihydro-2H-1-benzopyran-2- methanol] hydrochloride salt, which can be converted into nebivolol.
本发明涉及一种从对映异构体对的混合物中分离所需的对映异构体对,从而获得尼比地尔中间体的过程。因此,将(+)-[1S*(R*)]-6-氟-3,4-二氢-α-[[苯甲基]氨基甲基]-2H-1-苯并吡喁-2-甲醇,(+)-[1S*(S*)]-6-氟-3,4-二氢-2-氧环丙基-2H-1-苯并吡喁和乙醇的混合物加热至沸腾温度,并在相同温度下搅拌8小时,以获得(+)-[2R*[1S*,5S*(S*)]]+[2R*[1S*,5R*(R*)]]-α,α'-[苯甲基亚胺双(亚甲基)]双[6-氟-3,4-二氢-2H-1-苯并吡喁-2-甲醇]。然后将反应物冷却至10ºC,用HCl气体调节pH至2,并在25ºC至30ºC搅拌45分钟。然后将分离的固体过滤并干燥,得到(+)-[2R*[1S*,5S*(S*)]]-α,α'-[苯甲基亚胺双(亚甲基)]双[6-氟-3,4-二氢-2H-1-苯并吡喁-2-甲醇]盐酸盐,可转化为尼比地尔。