Simple and Clean Photoinduced Aromatic Trifluoromethylation Reaction
作者:Lu Li、Xiaoyue Mu、Wenbo Liu、Yichen Wang、Zetian Mi、Chao-Jun Li
DOI:10.1021/jacs.6b02782
日期:2016.5.11
We describe a simple, metal- and oxidant-free photochemical strategy for the direct trifluoromethylation of unactivated arenes and heteroarenes under either ultraviolet or visible light irradiation. We demonstrated that photoexcited aliphatic ketones, such as acetone and diacetyl, can be used as promising low-cost radical initiators to generate CF3 radicals from sodium triflinate efficiently. The broad
An efficient and environmentally benign electrochemical oxidative radical C—H trifluoromethylation of arenes by employing Langlois reagent as the CF3 source was developed in this work. Neither transition metal catalysts nor external chemical oxidants were required in this trifluoromethylation process. The reaction could be conducted in gram scale with high reaction efficiency.
, transition-metal-free, photocatalyst-free, and oxidant-free trifluoromethylation has been demonstrated. Triflicanhydride (Tf2O), being inexpensive and readily available, was chosen as the radical trifluoromethyl source. Thianthrene was used as a recyclable Tf2O-activating reagent, and a high-yielding and scalable trifluoromethylation reaction was achieved. Density functional theory and mechanistic
已经证明了一种有吸引力的、多功能的、操作简单的、可见光诱导的、无过渡金属、无光催化剂和无氧化剂的三氟甲基化。三氟甲磺酸酐 (Tf 2 O) 便宜且容易获得,被选为自由基三氟甲基源。噻蒽被用作可回收的 Tf 2 O 活化剂,实现了高产和可扩展的三氟甲基化反应。密度泛函理论和机理研究表明,可见光激发的自由基均裂过程参与了该反应,产生了关键的三氟甲基自由基中间体。
Nickel and Palladium Catalyzed C−H Trifluoromethylation using Trifluoromethyliodide: Investigations into New Reactivity
作者:Nicholas S. D. Solomon、Mohan Bhadbhade、Ruoming Tian、Sinead T. Keaveney
DOI:10.1002/cctc.202200918
日期:2022.10.21
What's the mechanism? Experimental and computational investigations into the use of CF3I in transition metal catalyzed trifluoromethylation is reported. C−H trifluoromethylation of arenes had been developed, using both palladium and nickel catalysts. Our preliminary mechanistic proposal is that the key C−Hactivation step is facilitated by an unusual difluorocarbene intermediate, and that arylCF3 formation