申请人:Lonza AG
公开号:US05939549A1
公开(公告)日:1999-08-17
A process for the production of 1,4,5,6-tetrahydropyrazine-2-carboxylic acid amides of the general formula (I), where R.sup.1 means hydrogen, alkyl, cycloalkyl or arylalkyl, R.sup.2 means alkyl, aryl or arylalkyl and R.sup.3, R.sup.4 and R.sup.5 mean independently from each other hydrogen, alkyl, aryl or arylalkyl or R.sup.2 forms an alicyclic system with R.sup.3 or R.sup.4 and the adjacent C atom(s), R.sup.6 being hydrogen or acyl. The products are obtained from the corresponding tetrahydropyrazine carboxylic acid nitriles and olefins or corresponding carbenium ion precursors and possibly carboxylic acids in a Ritter reaction. The products are new and can be used, for example, for the production of piperazine carboxylic acid amides. ##STR1##
一种生产通式为(I)的1,4,5,6-四氢吡嗪-2-羧酸酰胺的方法,其中R.sup.1代表氢、烷基、环烷基或芳基烷基,R.sup.2代表烷基、芳基或芳基烷基,R.sup.3、R.sup.4和R.sup.5各自独立地代表氢、烷基、芳基或芳基烷基,或者R.sup.2与R.sup.3或R.sup.4及相邻的碳原子形成脂环系统,R.sup.6代表氢或酰基。该产品是从相应的四氢吡嗪羧酸腈和烯烃或相应的卡宾离子前体以及可能的羧酸在里特反应中获得的。该产品是新产品,可以用于生产哌嗪羧酸酰胺等。