A short series of alkynyl-substituted pyrazine and pyridine derivatives was synthesized by the palladium-catalyzed Sonogashira cross-coupling reactions between aryl halides and alkynes. All the products are either white solids or colorless liquids, which is partly in contrast to previous reports. After purification, a color change or intense darkening was observed, in some cases starting almost immediately
通过芳基卤化物和
炔烃之间的
钯催化的Sonogashira交叉偶联反应,合成了一系列的炔基取代的
吡嗪和
吡啶衍生物。所有产品均为
白色固体或无色液体,这在一定程度上与以前的报道形成了鲜明对比。纯化后,观察到颜色变化或强烈变黑,在某些情况下几乎立即开始。杂芳环的性质和炔基部分的取代基均影响它们的稳定性。本文报道了合成,表征以及最重要的是纯化和处理的细节。