[EN] NOVEL SYNTHESIS AND CRYSTALLIZATION OF PIPERAZINE RING-CONTAINING COMPOUNDS<br/>[FR] NOUVELLE SYNTHESE ET CRISTALLISATION DE COMPOSES CONTENANT DE LA PIPERAZINE
申请人:TEVA PHARMA
公开号:WO2000062782A1
公开(公告)日:2000-10-26
The present invention is directed to methods for the preparation of piperazine ring-containing compounds, particularly mirtazapine. According to the present invention, the mirtazapine intermediate 1-(3-carboxypyridyl-2)-4-methyl-2-phenyl-piperazine is made by hydrolyzing 1-(3-cyanopyridyl-2)-4-methyl-2-phenyl-piperazine with a base where the base is present in a ratio of up to about 12 moles of the base per one mole of 1-(3-cyanopyridyl-2)-4-methyl-2-phenyl-piperazine. The mirtazapine intermediate 1-(3-carboxypyridly-2)-4-methyl-2-phenyl-piperazine may be made by hydrolyzing 1-(3-cyanopyridyl-2)-4-methyl-2-phenyl-piperazine with potassium hydroxide at a temperature of at least about 130 °C. The method of the present invention also includes reacting 2-amino-3-hydroxymethyl pyridine with N-methyl-1-phenyl-2, 2'-iminodiethyl chloride to form 1-(3-hydroxymethylpyridyl-2)-4-methyl-2-phenyl piperazine, and adding sulfuric acid to the 1-(3-hydroxymethylpyridyl-2)-phenyl-4-methylpiperazine to form mirtazapine. The present invention also relates to new processes for recrystallization of mirtazapine form crude mirtazapine.
本发明涉及制备含哌嗪环化合物的方法,特别是米氮平的方法。根据本发明,米氮平中间体1-(3-羧基吡啶-2)-4-甲基-2-苯基哌嗪是通过将1-(3-氰基吡啶-2)-4-甲基-2-苯基哌嗪在碱的存在下水解而制得的,其中碱的比例为每摩尔1-(3-氰基吡啶-2)-4-甲基-2-苯基哌嗪至多可达约12摩尔。米氮平中间体1-(3-羧基吡啶-2)-4-甲基-2-苯基哌嗪可通过在至少约130°C的温度下将1-(3-氰基吡啶-2)-4-甲基-2-苯基哌嗪与氢氧化钾水解而制得。本发明的方法还包括将2-氨基-3-羟甲基吡啶与N-甲基-1-苯基-2,2'-亚胺二乙基氯化物反应,形成1-(3-羟甲基吡啶-2)-4-甲基-2-苯基哌嗪,并向1-(3-羟甲基吡啶-2)-苯基-4-甲基哌嗪中加入硫酸,形成米氮平。本发明还涉及从粗制米氮平中重新结晶的新工艺。