申请人:Euticals Prime European Therapeutical SpA
公开号:US06765097B1
公开(公告)日:2004-07-20
A process is described for the preparation of arylpyridine compounds by aryl-aryl cross-coupling reactions between a halopyridine and an arylmagnesium halide carried out in the presence of a catalytic amount of a zinc salt and a catalytic amount of palladium. The zinc salt is preferably selected from ZnCl2, ZnBr2 and/or Zn(OAc)2, while the palladium is preferably used in the form of Pd(PPh3)4 or Pd(OAc)2 +4 PPh3. The reaction can also be carried out in the presence of bidentate phosphines, such as, for example, 1,3-bis(diphenylphosphine)propane or 1,4-bis(diphenylphosphine)-butane. It is thus possible to obtain molar yields higher than 97% (calculated relative to the halopyridine) and a catalyticity of more than 2000.
描述了一种通过卤代吡啶和芳基镁卤化物之间的芳基-芳基交叉偶联反应制备芳基吡啶化合物的方法,该方法在存在少量锌盐和少量钯的催化剂的情况下进行。锌盐优选从ZnCl2、ZnBr2和/或Zn(OAc)2中选择,而钯优选以Pd(PPh3)4或Pd(OAc)2+4 PPh3的形式使用。反应还可以在双膦的存在下进行,例如1,3-双(二苯基膦)丙烷或1,4-双(二苯基膦)-丁烷。因此,可以获得高于97%的摩尔产率(相对于卤代吡啶计算)和超过2000的催化活性。