[EN] IMPROVED PROCESS FOR THE MANUFACTURE OF 1,2-DISUBSTITUTED HEXAHYDROPYRIDAZINE-3-CARBOXYLIC ACIDS AND ESTERS THEREOF<br/>[FR] PROCEDE AMELIORE DE FABRICATION D'ACIDES HEXAHYDROPYRIDAZINE-3-CARBOXYLIQUES 1,2-DISUBSTITUES ET LEURS ESTERS
申请人:HONEYWELL SPECIALTY CHEMICALS
公开号:WO2005028449A1
公开(公告)日:2005-03-31
The invention relates to an improved process for the manufacture of 1,2-disubstituted hexahydro-pyridazine-3-carboxylic acids and esters thereof by reacting N,N’-disubstituted hydrazine with 2,5-dihalogenated valeric acids and thereof by means of phase transfer catalysis. Said pyridazine carboxylic acids and esters thereof can be used as intermediates for the production of pharmaceutical products
该发明涉及一种改进的工艺,通过相转移催化作用,将N,N'-二取代肼与2,5-二卤代戊二酸反应,制备1,2-二取代六氢吡啶并-3-羧酸及其酯。所述吡啶羧酸及其酯可用作制药产品的中间体。