The present invention relates to a new process for the preparation of N-[5-(3-dimethylamino-acryloyl)-2-fluoro-phenyl]-N-methyl-acetamide (I) in a high yield and high purity, which is an intermediate in the synthesis of compounds with affinity for GABAA receptor. In this process, N-(5-acetyl-2- fluorophenyl)-N-methyl-acetamide (VI) is reacted with an excess of N,N-dimethylformamide dimethyl acetal (NNDMF-DMA). The present invention also provides a new process for the preparation of a compound with affinity for GABAA receptor, N-2-fluoro-5-[3-(thiophene)-2-carbonyl-pyrazolo[1,5- a]pyrimidin-7-yl]phenyl}-N-methyl-acetamide (II), which comprises the following steps: a) methylation of N-(5-acetyl-2-fluorophenyl)-N-acetamide (IV) with a methyl sulfonate, b) reaction of the resulting compound (VI) with NNDMF-DMA, and c) reaction of the resulting compound (I) with (5-amino-1H- pirazol-4-yl)thiophen-2-yl-methanone (III) in glacial acetic acid. The present invention also relates to new intermediate (VI).
本发明涉及一种新的工艺,用于以高产率和高纯度制备N-[5-(3-二甲基
氨基
丙烯酰基)-2-
氟苯基]-N-甲基乙酰胺(I),该化合物是合成对
GABAA受体具有亲和力的化合物的中间体。在这个工艺中,N-(5-乙酰基-2-
氟苯基)-N-甲基乙酰胺(VI)与过量的
N,N-二甲基甲酰胺二
甲醚(NN
DMF-DMA)发生反应。本发明还提供了一种用于制备具有对
GABAA受体亲和力的化合物N-2-
氟-5-[3-(
噻吩)-2-羰基
吡唑并[1,5-a]
嘧啶-7-基]苯基}-N-甲基乙酰胺(II)的新工艺,包括以下步骤:a)用
甲基磺酸酯对N-(5-乙酰基-2-
氟苯基)-N-乙酰胺(IV)进行甲基化,b)将得到的化合物(VI)与NN
DMF-DMA反应,c)将得到的化合物(I)与(5-
氨基-1H-
吡唑并[1,5-a]
嘧啶-4-基)
噻吩-2-基甲酮(III)在
冰乙酸中反应。本发明还涉及新的中间体(VI)。