Supernucleophilic 4-substituted-pyridine catalysts, and processes useful for preparing same
    3.
    发明授权
    Supernucleophilic 4-substituted-pyridine catalysts, and processes useful for preparing same 有权
    超亲核性4-取代吡啶催化剂及其制备方法

    公开(公告)号:US06603010B2

    公开(公告)日:2003-08-05

    申请号:US09993046

    申请日:2001-11-06

    IPC分类号: C07D21302

    摘要: Described are preferred processes for producing extrusion-granulated supernucleophilic 4-amino-substituted pyridine catalysts, and granular products obtainable thereform. Also described are preferred activation-substitution-deactivation processes for producing 4-aminopyridine compounds, which involve the use of acrylic acid or acrylamide or analogs thereof for activation, and substitution steps conducted under mild basic conditions in an excess of the amine reagent for 4-substitution. Such processes provide improved reacted masses which are more readily processed to recover the products in pure, heat-stable form. Further, described are processes for preparing 4-substituted-pyridines via pyridine betaines.

    摘要翻译: 描述了用于生产挤压造粒的超亲核4-氨基取代的吡啶催化剂的优选方法,以及可获得的颗粒产品。 还描述了用于生产4-氨基吡啶化合物的优选的活化取代失活方法,其涉及使用丙烯酸或丙烯酰胺或其类似物进行活化,以及在温和的碱性条件下在过量的胺试剂中进行4-取代 - 代换。 这些方法提供改进的反应物质,其更容易加工以以纯的,热稳定的形式回收产物。 此外,描述了通过吡啶甜菜碱制备4-取代吡啶的方法。