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    • 2. 发明授权
    • Preparation of 2-amino-3-cyano-5-dialkoxymethylpyrazines and
intermediates for this method
    • 2-氨基-3-氰基-5-二烷氧基甲基吡嗪的制备及其制备方法
    • US4725689A
    • 1988-02-16
    • US776462
    • 1985-09-16
    • Hartmut LeiningerWolfgang LittmannJoachim Paust
    • Hartmut LeiningerWolfgang LittmannJoachim Paust
    • C07D241/20C07D241/26C07D403/04C07D475/04
    • C07D403/04C07D241/20C07D241/26Y02P20/55
    • 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(III)的2-氨基-3-氰基-5-二烷氧基甲基吡嗪衍生物其中R 1和R 2各自为氢或通常用于氨基的保护基,R 5和R 6各自为1-4的烷基 碳原子,或一起形成未被取代或被甲基取代的乙烯或丙烯基团,由式IV(IV)的新型3-卤代甲基-5-二卤代甲基-2-氨基吡嗪衍生物制备,其中X为 Cl或Br通过通式I的新型中间体(I),其中R 3是-CH 2 -O-CO-CH 3(a),-CH 2 OH(b),(c)或-C 3 N(d)和R4是-CHCl 2或-CHBr 2,或者其中R 1和R 2各自是保护基,R 4还可以是本发明的化合物是用于制备叶酸和活性化合物的有用中间体 由此。