PROCESS FOR THE SYNTHESIS OF 4H-IMIDAZO [1,5-a] [1,4] BENZODIAZEPINES, IN PARTICULAR MIDAZOLAM AND SALTS THEREOF
申请人:Castellin Andrea
公开号:US20110275799A1
公开(公告)日:2011-11-10
The present invention refers to a process for the preparation of 4H-imidazo[1,5-a][1,4]benzodiazepines, in particular Midazolam, through an efficient and selective decarboxylation reaction of the derivative compound of the 5-aminomethyl-1-phenyl-1H-imidazole-4-carboxylic acid of formula (II)
avoiding the formation of the 6H-imidazo[1,5-a][1,4]benzodiazepines by-products and the ensuing process for the isomerisation of a 4H-imidazo[1,5-a][1,4]benzodiazepine product.
本发明涉及一种制备4H-咪唑[1,5-a][1,4]苯二氮䓬酮,特别是米达唑的过程,通过对公式(II)的5-氨基甲基-1-苯基-1H-咪唑-4-羧酸衍生物的有效和选择性脱羧反应,避免形成6H-咪唑[1,5-a][1,4]苯二氮䓬酮副产物,并随后进行4H-咪唑[1,5-a][1,4]苯二氮䓬酮产物的异构化过程。