申请人:BASF Aktiengesellschaft
公开号:US04725689A1
公开(公告)日:1988-02-16
2-Amino-3-cyano-5-dialkoxymethylpyrazine derivatives of the general formula III ##STR1## where R.sup.1 and R.sup.2 are each hydrogen or a protective group usually employed for amino groups and R.sup.5 and R.sup.6 are each alkyl of 1 to 4 carbon atoms, or together form an ethylene or propylene radical which is unsubstituted or substituted by methyl, are prepared starting from a novel 3-halomethyl-5-dihalomethyl-2-aminopyrazine derivative of the formula IV ##STR2## where X is Cl or Br, via a novel intermediate of the general formula I ##STR3## where R.sup.3 is --CH.sub.2 --O--CO--CH.sub.3 (a), --CH.sub.2 OH (b), ##STR4## or --C.tbd.N (d) and R.sup.4 is --CHCl.sub.2 or --CHBr.sub.2 or, where R.sup.1 and R.sup.2 are each a protective group, R.sup.4 may furthermore be ##STR5## The compounds according to the invention are useful intermediates for the preparation of folic acid and active compounds derived from this.
通式III的2-氨基-3-氰基-5-二烷氧甲基吡嗪衍生物,其中R.sup.1和R.sup.2分别为氢或通常用于氨基保护基的保护基,R.sup.5和R.sup.6分别为1至4个碳原子的烷基,或者一起形成未取代或取代甲基的乙烯基或丙烯基基团,从式IV的新型3-卤代甲基-5-二卤代甲基-2-氨基吡嗪衍生物开始制备,式IV为##STR2##其中X为Cl或Br,通过通式I的新型中间体制备,通式I为##STR3##其中R.sup.3为--CH.sub.2--O--CO--CH.sub.3(a),--CH.sub.2OH(b),##STR4##或--C.tbd.N(d),R.sup.4为--CHCl.sub.2或--CHBr.sub.2,或者当R.sup.1和R.sup.2均为保护基时,R.sup.4还可以是##STR5##本发明化合物是制备叶酸和由此衍生的活性化合物的有用中间体。