quinoxalines, and quinazolines exhibit an unusual regioelectronic effect that controls the type of addition reaction observed. Depending on the ring position of the vinyl substituent, either conjugate addition or Markovnikov addition occurs. The mode of addition has been shown to correlate well to NBO calculated charges.
已经研究了
乙烯基取代的 N-杂环的超酸促进反应。双质子化
嘧啶、
喹喔啉和
喹唑啉表现出不寻常的区域电子效应,可控制所观察到的加成反应类型。根据
乙烯基取代基的环位置,发生共轭加成或马尔可夫尼科夫加成。添加方式已被证明与 NBO 计算的费用相关。