Pharmaceutically acceptable inorganic and organic salts of 5-methylpyrazine-2-carboxylic acid-4-oxide
申请人:Cooney Mark
公开号:US20050261312A1
公开(公告)日:2005-11-24
Methods for the preparation of pharmaceutically acceptable organic or inorganic salts of 5-methylpyrazinecarboxylic acid-4-oxide esters including tris(hydroxymethyl)aminomethanol, N,N-dimethylethanolamine, N-methyl-D-glucamine, L-Lysine, L-arginine, Na, K, Ca and Mg. The esters of 5-methylpyrazinecarboxylic acid-4-oxide are oxidized in aqueous hydrogen peroxide at a pH of 2.5 to 7 in the presence of a catalyst selected from the group consisting of sodium tungstate, tungstic acid and ammonium heptamolybdate. The salts are formed by saponification of the esters followed by alcohol precipitation, or by reaction with a metal trimethylsilanoate, or by the reaction of organic bases with the saponified acids.
制备5-甲基吡啶羧酸-4-氧化物酯的药用可接受的有机或无机盐的方法包括三(羟甲基)氨甲醇、N,N-二甲基乙醇胺、N-甲基-D-葡萄糖胺、L-赖氨酸、L-精氨酸、钠、钾、钙和镁。在水性过氧化氢的存在下,5-甲基吡啶羧酸-4-氧化物酯在pH为2.5至7的条件下氧化,催化剂选自钨酸钠、钨酸和七钼酸铵。盐的形成通过酯的皂化后醇沉淀,或与金属三甲基硅酸酯反应,或与皂化酸的有机碱反应而得到。