Preparation of 4,5-diamino-1-(substituted)-pyrazole and acid addition salts thereof
申请人:Chamberlin Steven Kim
公开号:US20070037987A1
公开(公告)日:2007-02-15
Disclosed is an improved process for the preparation of 4,5-diamino-1-(substituted)pyrazoles and acid addition salts thereof by coupling the corresponding 5-amino-1-(substituted)pyrazole with an aromatic diazonium compound to produce an intermediate azo compound and contacting the intermediate azo compound with hydrogen in the presence of a hydrogenation catalyst to produce 4,5-diamino-1-(substituted)pyrazoles. Also disclosed is a decarboxylation process for the preparation of a 5-amino-1-(substituted)pyrazole by heating a solution comprising a 5-amino-4-carboxy-1-(substituted)pyrazole, an inorganic acid and an inert solvent.
本发明公开了一种改进的工艺,用于制备4,5-二氨基-1-(取代)吡唑及其酸加成盐,其方法是将相应的5-氨基-1-(取代)吡唑与芳香族重氮化合物偶联,生成中间偶氮化合物,然后在氢化催化剂的存在下将中间偶氮化合物与氢接触,制备4,5-二氨基-1-(取代)吡唑。本发明还公开了一种脱羧工艺,以制备5-氨基-1-(取代)吡唑,其方法是通过加热包含5-氨基-4-羧基-1-(取代)吡唑、无机酸和惰性溶剂的溶液进行脱羧反应。