A visible-light photoredox functionalization of 3,4-dihydro-quinoxalin-2-ones with pyrazolones using an inexpensive organophotoredox catalyst is described. The reaction uses 9,10-phenanthrenedione as photocatalyst, a very simple and cheap photocatalyst, a HP single Blue LED (455 nm) as visible-light source and oxygen from air as terminal oxidant, obtaining the corresponding acetylated pyrazoles with
描述了使用廉价的有机光氧化还原催化剂对 3,4-二氢-
喹喔啉-2-酮与
吡唑啉酮进行可见光光氧化还原功能化。该反应使用9,10-
菲二酮作为光催化剂,一种非常简单且廉价的光催化剂,HP单蓝光LED(455 nm)作为可见光源,空气中的
氧气作为终端氧化剂,以良好的产率得到相应的乙酰化
吡唑。该反应可以扩展到其他含氮
杂环化合物,例如 5-
氨基
吡唑,并取得了良好的效果。