A process for preparation of perindopril of formula (II) and salts thereof
which is simple, safe convenient and cost-effective.
The process involves reaction of compound of formula (I),
wherein X is chlorine or bromine with compound of formula (VII)
wherein A signifies that the six-membered ring of the bicyclic system is either saturated or unsaturated to give compound of formula (VIII),
wherein A is as defined above, followed by catalytic hydrogenation of the compound of formula (VIII) thus obtained to give the perindopril of formula (II). The above process for the manufacture of perindopril would specifically avoid the use of harmful chemicals like phosgene or costly coupling agents like dicyclohexylcarbodiimide and 1-hydroxybenxotriazole usually used for such manufacture. The process would also not require any intervention of a catalyst and does not require any alkaline or acidic reaction conditions. Importantly, the process provides for manufacture of perindopril with high stereoselectively giving perindopril (II) having (S)-configuration in all the five chiral centres of the molecule, conforming to pharmacoepeial specifications.
The invention also relates to a method for preparation of the compound of formula (I) and also to a method for preparation of N-[(S)-
1
-carbethoxybutyl]-(S)-alanine of formula (III) used in the process.
一种制备公式(II)的普利度洛及其盐的方法,该方法简单、安全、方便、经济。该方法涉及公式(I)化合物(其中X为
氯或
溴)与公式(VII)化合物反应(其中A表示双环系统的六元环饱和或不饱和),以得到公式(VIII)化合物(其中A如上所定义),随后对所得的公式(VIII)化合物进行催化氢化,以得到公式(II)的普利度洛。上述制备普利度洛的方法将特别避免使用有害
化学品如
光气或昂贵的
偶联剂如二环己基碳二
亚胺和
1-羟基苯并三唑通常用于此类制造。该方法也不需要催化剂的干预,也不需要碱性或酸性反应条件。重要的是,该方法提供了高立体选择性的普利度洛制造,使得分子的所有五个手性中心都具有(S)-构型,符合药典规格。本发明还涉及公式(I)化合物的制备方法,以及在该过程中使用的公式(III)N-[(S)-1-羧乙氧基丁基] -(S)-丙
氨酸的制备方法。