The invention relates to a process for the preparation of 3-2-[4-(6-fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]ethyl}-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one of the Formula (I), and pharmaceutically acceptable acid addition salts thereof by subjecting the oxime of the Formula (II), to ring-closure in the presence of an alkali hydroxide, alkali carbonate or alkali-C
1-4
alkoxide in an inert organic solvent, converting the base of the Formula I thus obtained into an acid addition salt or setting free the base of the Formula I from an acid addition salt thereof which comprises reacting a halogen derivative of the general Formula (XIV), (wherein Hal is halogen) with piperidine oxime derivative of the Formula (V), or an acid addition salt thereof in the presence of a base, and using by the ring-closure of the oxime of the Formula II formed a C
1-4
-alkanol as inert solvent. The process of the present invention enables the economical preparation of a product having a purity suitable for pharmaceutical purposes.
本发明涉及一种制备公式(I)中的3-2-[4-(6-
氟-1,2-苯并
异噁唑-3-基)-1-
哌啶基]乙基}-6,7,8,9-四氢-2-甲基-4H-
吡啶[1,2-a]
嘧啶-4-酮及其药学上可接受的酸加成盐的过程,包括在惰性有机溶剂中在碱性氢氧化物、碱性
碳酸盐或碱性C1-4烷氧化物的存在下,使公式(II)的
肟在环闭合的情况下,将公式I的碱转化为酸加成盐或从其酸加成盐中释放出公式I的碱。其中,该过程包括在碱的存在下,使用公式(XIV)的卤代衍
生物(其中Hal是卤素)与公式(V)的
哌啶肟衍
生物或其酸加成盐在惰性溶剂C1-4-烷醇中进行
肟的环闭合。本发明的过程能够经济地制备出适用于药物用途的纯度合适的产物。