The present invention provides a process for the preparation of a 4H-pyrrido[1,2-a]-pyrimidin-4-one derivative, wherein the 4H-pyrrido[1,2-a]-pyrimidin-4-one derivative is Paliperidone or 3-(2-chloroethyl)-6,7,8,9-tetrahydro-9-hydroxy-2-methyl-4H-pyrrido[1,2-a]-pyrimidin-4-one (‘CMHTP’), said process comprising enzymatically hydroxylating Risperidone or 3-(2-chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrrido[1,2-a]-pyrimidin-4-one (‘ClMTTP’), respectively, with at least one oxidoreductase enzyme; and optionally isolating or purifying the Paliperidone or CMHTP, wherein the at least one oxidoreductase enzyme is selected from the group of peroxidases, dioxygenases, monooxygenases and any combination thereof.
本发明提供了一种制备4H-
吡啶并[1,2-a]-
嘧啶-4-酮衍
生物的方法,其中4H-
吡啶并[1,2-a]-
嘧啶-4-酮衍
生物是
帕利哌酮或3-(2-
氯乙基)-6,7,8,9-四氢-9-羟基-2-甲基-4H-
吡啶并[1,2-a]-
嘧啶-4-酮(“C
MHTP”),该方法包括使用至少一种氧化还原酶酶将
利培酮或3-(2-
氯乙基)-6,7,8,9-四氢-2-甲基-4H-
吡啶并[1,2-a]-
嘧啶-4-酮(“ClM
TTP”)分别
水解,以及可选地分离或纯化
帕利哌酮或C
MHTP,其中至少一种氧化还原酶酶被选择自
过氧化物酶、二氧化酶、单加氧酶和任何其组合的群组中。