[EN] PROCESS FOR PREPARING 1-METHYL-1,2,3,4-TETRAHYDROISOQUINOLINE OR A SALT THEREOF<br/>[FR] PROCEDE DE PREPARATION D'UN 1-METHYL-1,2,3,4-TETRAHYDROISOQUINOLINE OU SON SEL
申请人:SB PHARMCO INC
公开号:WO2002088088A1
公开(公告)日:2002-11-07
The invention provides a process for preparing 1-methyl-1,2,3,4-tetrahydroisoquinoline of formula (A), or a salt thereof, the process comprising: (i) reacting N-(2-chloroethyl)-α-methylbenzylamine of formula (B), or a salt thereof, with a Lewis acid such as AlCl3, and (ii) causing or allowing cyclisation to 1-methyl-1,2,3,4-tetrahydroisoquinoline. The invention also provides a process for preparing 1-methyl-1,2,3,4-tetrahydroisoquinoline of formula (A), or a salt thereof, the process comprising: (i) reacting a N-(2-haloethyl)-α-methylbenzylamine, or a salt thereof, with a Lewis acid and (ii) causing or allowing cyclisation to 1-methyl-1,2,3,4-tetrahydroisoquinoline at a temperature of ≤130°C. The use of N-(2-chloroethyl)-α-methylbenzylamine and/or lower cyclisation temperatures decreases the amount of certain impurities formed in the reaction. In other aspects of the invention, the 1-methyl-1,2,3,4-tetrahydroisoquinoline can be used in the synthesis of 5,6-dimethyl-2-(4-fluorophenylamino)-4-(1-methyl-1,2,3,4-tetrahydroisoquinolin-2-yl)pyrimidine (SB 641257, YH1885), a pharmaceutically active reversible proton pump inhibitor.
本发明提供了一种制备公式(A)的1-甲基-1,2,3,4-四氢异喹啉或其盐的方法,该方法包括:(i)将公式(B)的N-(2-氯乙基)-α-甲基苯乙胺或其盐与类似于AlCl3的Lewis酸反应,以及(ii)引起或允许环化成为1-甲基-1,2,3,4-四氢异喹啉。本发明还提供了一种制备公式(A)的1-甲基-1,2,3,4-四氢异喹啉或其盐的方法,该方法包括:(i)将N-(2-卤乙基)-α-甲基苯乙胺或其盐与Lewis酸反应,以及(ii)在≤130°C的温度下引起或允许环化成为1-甲基-1,2,3,4-四氢异喹啉。使用N-(2-氯乙基)-α-甲基苯乙胺和/或较低的环化温度可以减少反应中形成的某些杂质的量。在本发明的其他方面中,1-甲基-1,2,3,4-四氢异喹啉可用于合成5,6-二甲基-2-(4-氟苯氨基)-4-(1-甲基-1,2,3,4-四氢异喹啉-2-基)嘧啶(SB 641257,YH1885),一种药物活性的可逆质子泵抑制剂。