申请人:Pechiney Ugine Kuhlmann
公开号:US03932404A1
公开(公告)日:1976-01-13
Process for the preparation of an amino-pyrazine falling within the formula: ##SPC1## In which R.sub.1 and R.sub.2 each represent a hydrogen atom, or an alkyl or aryl group, or together with the carbon atoms of the pyrazine ring form a cyclic hydrocarbon having 5 to 7 carbon atoms, and X represents a cyano, carboxy, carbonamido, alkoxy-carbonyl or aryloxycarbonyl group which comprises subjecting a 2-aza-1,3-butadiene of the general formula: ##EQU1## wherein Z and Zi each represent an alkyl group or together with the nitrogen atom form a heterocyclic compound possibly containing another hetero atom to the action of ammonia and reacting the 4-amino-2-aza-1,3-butadiene of formula ##EQU2## thus obtained with a basic agent: novel compounds of formula VIII in which R.sub.1 and R.sub.2 each represent a different alkyl or aryl group or together with the carbon atoms of the pyrazine ring form a cyclic hydrocarbon containing 5 to 7 carbon atoms: intermediate compounds of formula: ##EQU3## wherein X, R.sub.1 and R.sub.2 have the meanings given above and Z and Z' each represent an alkyl group or together with the nitrogen atom form a heterocyclic compound possibly containing another hetero-atom; and intermediate compounds of the formula: ##EQU4## wherein X, R.sub.1 and R.sub.2 have the meanings given above.
制备符合以下结构的氨基吡嗪的过程:##SPC1## 其中R.sub.1和R.sub.2分别代表氢原子,或烷基或芳基团,或与吡嗪环的碳原子一起形成含有5至7个碳原子的环烃,X代表氰基,羧基,碳酰胺基,烷氧基羰基或芳氧基羰基团,包括将一般式的2-氮代-1,3-丁二烯:##EQU1## 其中Z和Zi分别代表烷基团,或与氮原子一起形成可能含有另一种杂原子的杂环化合物,经过氨的作用,并将得到的式为##EQU2##的4-氨基-2-氮代-1,3-丁二烯与一种碱性试剂反应:式为VIII的新化合物,其中R.sub.1和R.sub.2分别代表不同的烷基或芳基团,或与吡嗪环的碳原子一起形成含有5至7个碳原子的环烃:中间体化合物的式为:##EQU3## 其中X,R.sub.1和R.sub.2具有上述给定的含义,Z和Z'分别代表烷基团,或与氮原子一起形成可能含有另一种杂原子的杂环化合物;和中间体化合物的式为:##EQU4## 其中X,R.sub.1和R.sub.2具有上述给定的含义。