[EN] PROCESS FOR THE SYNTHESIS OF ARFORMOTEROL<br/>[FR] PROCESSUS POUR LA SYNTHÈSE D'ARFORMOTÉROL
申请人:CIPLA LTD
公开号:WO2009147383A1
公开(公告)日:2009-12-10
The present invention provides a process for preparing a compound of formula (Vl) or a salt thereof, the process comprising: (i) reacting 4-methoxyphenyl acetone with an amine of formula (VIII) under conditions of reductive amination to produce a compound of formula (II) or a salt thereof, wherein there is no isolation of an imine intermediate formed during the reductive amination; (ii) condensing the compound (II) or the acid addition salt thereof with an α-haloketone of formula (III) to produce the compound of formula (IV); (iii) reducing the compound (IV) to a compound of formula (V); and (iv) reducing the compound (V) to the compound of formula (Vl), wherein the reduction is carried out in the presence of either (1 ) a hydrogen donating compound in the presence of a hydrogen transfer catalyst; or (2) ammonium formate using a hydrogenation catalyst, wherein: R1 and R2 are independently optionally substituted arylalkyl, and Hal is selected from chloro or bromo.
本发明提供了一种制备化合物(Vl)或其盐的方法,所述方法包括:(i)在还原胺化条件下,将4-甲氧基苯乙酮与式(VIII)的胺反应,以产生化合物(II)或其盐,其中在还原胺化过程中不需要分离生成的亚胺中间体;(ii)将化合物(II)或其酸加成盐与式(III)的α-卤代酮缩合,以产生化合物(IV);(iii)将化合物(IV)还原为式(V)的化合物;和(iv)将化合物(V)还原为式(Vl)的化合物,其中还原在以下条件下进行:(1) 在氢传递催化剂存在下使用氢供体化合物;或(2) 使用氢化催化剂的甲酸铵,其中:R1和R2独立地是可选择地取代的芳基烷基,Hal选择自氯或溴。