Process improvement in the synthesis of N-A3-(3-cyanopyrazolo A1,5-aUpyrimidin-7-yl)phenylU-N-ethyl-acetamide.

摘要

The invention is a process improvement for producing N-Ä3-(3-cyanopyrazoloÄ1,5-aÜpyrimidin-7-yl)phenylÜ-N-ethyl-acetamide which is useful as an anxiolytic, antiepileptic, sedative-hypnotic agent and skeletal muscle relaxant, which comprises reacting 3-dimethylamino-1-(3-N-ethyl-N-acetylaminophenyl)-2-propen-1-one or a suitable salt thereof with 3-aminopyrazole-4-carbonitrile or a suitable salt thereof in a mixture comprising water and acetic acid.