General and Practical Carboxyl-Group-Directed Remote CH Oxygenation Reactions of Arenes
作者:Yang Wang、Anton V. Gulevich、Vladimir Gevorgyan
DOI:10.1002/chem.201303511
日期:2013.11.18
Two methods for remote aromatic CHoxygenationreactions, have been developed. Method 1, the Cu‐catalyzed oxygenationreaction, is highly efficient for cyclization of electron‐neutral and electron‐rich biaryl carboxylic acids into 3,4‐benzocoumarins. Method 2, the K2S2O8‐mediated oxygenationreaction, is more general and practical for cyclization of substrates with electron‐donating and ‐withdrawing
已经开发了两种用于远程芳族 C  H 氧化反应的方法。方法 1,即 Cu 催化的氧化反应,对于将电子中性和富电子的联芳基羧酸环化为 3,4-苯香豆素非常有效。方法 2,K 2 S 2 O 8介导的氧化反应,对于具有给电子和吸电子基团的底物的环化更为通用和实用(见方案)。
Pd-Catalyzed C–H Lactonization for Expedient Synthesis of Biaryl Lactones and Total Synthesis of Cannabinol
作者:Yan Li、Yan-Jun Ding、Jian-Yong Wang、Yi-Ming Su、Xi-Sheng Wang
DOI:10.1021/ol400877q
日期:2013.6.7
cyclization to construct biaryl lactones has been developed. The synthetic utility of this new reaction was demonstrated in an atom-economical and operationally convenient total synthesis of the natural product cannabinol from commercially available starting materials, with the newly developed method used for two key steps.
Palladium-Catalyzed Direct Annulation of Benzoic Acids with Phenols to Synthesize Dibenzopyranones
作者:Yang Wang、Jie-Yu Gu、Zhang-Jie Shi
DOI:10.1021/acs.orglett.7b00177
日期:2017.3.17
Direct annulation of benzoic acids with phenols via palladium-catalyzed oxidative coupling is reported. Readily available and inexpensive starting materials were used in this novel method to synthesize highly valuable and useful dibenzopyranone scaffolds. Broad substrate scope and simple operation make this method potentially practical. Preliminary mechanistic studies were conducted to understand this
Synthesis of 2-(Trifluoromethyl)-dibenzopyranones with Rhodium(III)-catalyzed Formal anti-Michael Addition as Key Step
作者:Ling Pan、Jinhuan Dong、Di Xie、Yifei Li、Qun Liu
DOI:10.1002/adsc.201701511
日期:2018.3.1
A novel rhodium(III)‐catalyzedsynthesis of 2‐(trifluoromethyl)‐dibenzopyranones from easily available 4‐(trifluoromethyl)‐p‐quinols and N‐methoxyarylamides is described. Rhodium(III)‐catalyzed formal anti‐Michael addition was proposed to be a crucial step in this [3+3] annulation with N‐methoxyarylamides as effective 1,3‐dipoles, providing a concise and efficient approach for the construction of