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。