A process for preparing 3-chloro-6-(2-hydroxyphenyl)pyridazines by the reaction of 6-(2-hydroxyphenyl)-3(2H)-pyridazinones with phosphorus oxychloride and a disubstituted formamide. The chloropyridazine compounds are useful intermediates for preparing compounds which have .beta.-adrenergic blocking and vasodilator activity and are useful as antihypertensive agents.
一种制备3-
氯-6-(2-羟基苯基)
吡啶嗪的方法,是通过6-(2-羟基苯基)-3(2H)-
吡啶酮与氧化亚
磷和二取代甲酰胺反应得到。这些
氯代
吡啶嗪化合物是制备具有β-
肾上腺素受体阻滞和扩血管活性的化合物的有用中间体,并且可用作降压剂。