申请人:HOECHST CELANESE CORPORATION
公开号:EP0415767A2
公开(公告)日:1991-03-06
A method for preparing pyridine carboxylic acid esters by reacting N-hydroxyamino derivatives of the formula:
wherein R₅ and R₆ are each independently H, COZ, or CN, provided that they are not both H; or R₅ and R₆ together are -CO-NR₁₀-CO; Z is OR₈ or NR₈R₉; R₈ and R₉are each independently H or alkyl or aryl; or R₈ and R₉ together with the nitrogen atom form an aliphatic or aromatic heterocyclic structures and R₁₀ is hydrogen, alkyl, aryl, hydroxy or an alkoxy of 1-6 carbon atoms; with an α,β-unsaturated aldehyde or ketone is disclosed. In an additional embodiment, an alkene of formula R₅-CH=CH-R₆, wherein R₅ and R₆ are defined as above, is reacted with hydroxylamine or a salt thereof to form N-hydroxylamino derivatives which are then treated as above.
一种通过与式中的 N-羟基氨基衍生物反应制备吡啶甲酸酯的方法:
其中R₅和R₆各自独立地为H、COZ或CN,但它们不能都是H;或R₅和R₆一起为-CO-NR₁₀-CO;Z为OR₈或NR₈;R₈和R₉各自独立地为H或烷基或芳基;或 R₈ 和 R𠢙 与氮原子一起形成脂肪族或芳香族杂环结构,且 R₁₀ 是氢、烷基、芳基、羟基或 1-6 个碳原子的烷氧基;公开了具有 α、β-不饱和醛或酮的化合物。在另一个实施方案中,式 R₅-CH=CH-R₆(其中 R₅ 和 R₆ 定义如上)的烯烃与羟胺或其盐反应生成 N-羟基氨基衍生物,然后按上述方法处理。