Cooperative NHC and Photoredox Catalysis for the Synthesis of β‐Trifluoromethylated Alkyl Aryl Ketones
作者:Qing‐Yuan Meng、Nadine Döben、Armido Studer
DOI:10.1002/anie.202008040
日期:2020.11.2
Despite the great potential of radical chemistry in organic synthesis, N‐heterocyclic carbene (NHC)‐catalyzed reactions involving radical intermediates are not well explored. This communication reports the three‐component coupling of aroyl fluorides, styrenes and the Langlois reagent (CF3SO2Na) to give various β‐trifluoromethylated alkylarylketones with good functional group tolerance in moderate to high
尽管自由基化学在有机合成中具有巨大潜力,但涉及自由基中间体的 N-杂环卡宾 (NHC) 催化反应尚未得到很好的探索。该通讯报道了芳酰氟、苯乙烯和 Langlois 试剂 (CF 3 SO 2 Na)的三组分偶联,通过光氧化还原/NHC 协同催化,以中等到高产率生成各种具有良好官能团耐受性的 β-三氟甲基化烷基芳基酮。烯烃酰基三氟甲基化通过羰基与苄基C-自由基的自由基/自由基交叉偶联进行。羰基自由基是通过原位形成的酰唑鎓离子的 SET 还原产生的,而苄基自由基则源自三氟甲基自由基加成到苯乙烯上。