A process for substituting and dequaternizing pyridylethyl quaternary salts of pyridine and bipyridine bases comprising the step of heating or reacting the pyridylethyl quaternary salt with a caustic material such as sodium hydroxide. Also included is a process for preparing a second pyridine base (or a bipyridine base) in which a first pyridine base is initially selected and its 2-(2-pyridyl)ethyl or 2-(4-pyridyl)ethyl quaternary salt or its acid salt prepared. An electrophilic, nucleophilic or coupling reaction can then be performed on the quaternary salt to change the substituent or to form the bipyridyl coupling and the resultant salt dequaternized with a caustic material, such as sodium hydroxide, to produce a second pyridine or a bipyridine base.
一种
吡啶和双
吡啶碱的
吡啶乙基季盐的取代和脱季工艺,包括将
吡啶乙基季盐与
氢氧化钠等腐蚀性物质加热或反应的步骤。还包括制备第二种
吡啶碱(或双
吡啶碱)的工艺,其中首先选择第一种
吡啶碱,然后制备其 2-(2-
吡啶基)乙基或 2-(4-
吡啶基)乙基季盐或其酸盐。然后可以在季盐上进行亲电、亲核或偶联反应,以改变取代基或形成联
吡啶偶联基,并用苛性物质(如
氢氧化钠)对生成的盐进行脱季处理,以生成第二个
吡啶或联
吡啶碱。