Synthesis of 2,3‐Dihydro‐4‐pyridones, 4‐Quinolones, and 2,3‐Dihydro‐4‐azocinones by Visible‐Light Photocatalytic Aerobic Dehydrogenation
作者:Adrian Sevenich、Paulina Sophie Mark、Torsten Behrendt、Jonathan Groß、Till Opatz
DOI:10.1002/ejoc.201900584
日期:2020.3.15
A protocol for the synthesis of three types of N‐heterocycles was developed. Cyclic enaminones were prepared under eco‐friendly conditions by photocatalytic dehydrogenation using rhodamine 6G as inexpensive photocatalyst and oxygen as the terminal oxidant. The method was extended to access azocinones by a [2+2] cycloaddition/ring‐expansion sequence in a one‐pot procedure.
已开发出用于合成三种类型的N-杂环的协议。环烯胺酮是在环境友好的条件下通过使用罗丹明6G作为廉价的光催化剂并使用氧气作为末端氧化剂进行光催化脱氢制备的。通过一锅法中的[2 + 2]环加成/扩环序列,将该方法扩展为可使用偶氮酮。