Abstract An efficient synthetic method for multi-substituted xanthones was developed. The reaction of diaryliodonium salts and salicylates was employed for the preparation of the xanthones. This method proceeded through an intermolecular etherification-acylation to give target heterocycles in good yields (up to 91%). Multi-substituted xanthones were gained by shifting the substituent of salicylates or
Synthesis of xanthones through the palladium-catalyzed carbonylation/C–H activation sequence
作者:Yingmeng Xu、Jing Zhou、Congcong Zhang、Ke Chen、Tao Zhang、Zhenting Du
DOI:10.1016/j.tetlet.2014.09.119
日期:2014.11
A series of xanthones with the dibenzo-γ-pyrone framework were synthesized through the palladium-catalyzed carbonylation/C–Hactivation sequence from the ortho diazonium salts of diaryl ethers in moderate to excellent yields. After screening the reaction condition, the optimal condition was 5 mol % tetrakis (triphenylphosphine) palladium (0) as the catalyst, potassium carbonate as the base, and toluene
Synthesis of Xanthones by Palladium-Catalyzed Tandem Carbonylation/C-H Activation via 2-Iodo Diaryl Ethers
作者:Rui-Yue Ma、Ya-Fang Chen、Jun-Ru Wang、Zhen-Ting Du
DOI:10.1002/jccs.201700125
日期:2018.1
The ring closure of 2‐iodo diaryl ether in the presence of a palladium catalyst to xanthone under carbon monoxide atmosphere is studied. A series of xanthones could be successfully obtained through this protocol, with Pd(OAc)2 as the catalyst, P(Cy)3 as ligand, PivONa.H2O as base, and PivOH and tetrabutylamonium bromide as additives in DMSO, in moderate to good yields.