Rhodium-Catalyzed Aerobic Decomposition of 1,3-Diaryl-2-diazo-1,3-diketones: Mechanistic Investigation and Application to the Synthesis of Benzils
作者:Jia-Liang Zhu、Yi-Ting Tsai
DOI:10.1021/acs.joc.0c02366
日期:2021.1.1
proceed via the interaction of a ketene intermediate resulting from a Wolff rearrangement of the carbenoid, with a rhodium peroxide or peroxy radical species generated upon the activation of molecular oxygen. The proposed mechanism has been supported by the results from a set of controlled experiments. By using this newly developed strategy, a large array of benzil derivatives as well as 9,10-phenanthrenequinone
基于铑(II)催化的需氧分解过程,报道了1,3-二芳基-2-重氮-1,3-二酮向1,2-二芳基-1,2-二酮(苯)的转化。该反应在环境温度下发生,并且可以在氧气的气球压力下由少量羧酸的铑(5mol%)催化。此外,显示出来自O 2试剂的氧原子被掺入产物中,并且这伴随着羰基单元从起始原料的挤出。从机理上讲,建议分解可以通过类胡萝卜素的沃尔夫重排产生的乙烯酮中间体与分子氧活化后产生的过氧化铑或过氧自由基的相互作用。一组受控实验的结果支持了所提出的机制。通过使用这种新开发的策略,从相应的重氮底物以不同的收率合成了大量苯并衍生物和9,10-菲醌。另一方面,由于难以诱导初始重排,该方法不能从2-重氮-1,3-茚满二酮生成苯并环丁烯-1,2-二酮。