synthesis of unsymmetrical and symmetrical diaryl sulfides via C–O bond activation are presented. First, a new efficient procedure for the synthesis of unsymmetrical sulfides using the cross-coupling reaction of phenolic esters such as acetates, tosylates, and triflates and with arylboronic acid or triphenyltin chloride as the coupling partners is reported. Depending on the reaction, S8/KF or S8/NaOt-Bu
Cross-Coupling of Phenol Derivatives with Umpolung Aldehydes Catalyzed by Nickel
作者:Leiyang Lv、Dianhu Zhu、Jianting Tang、Zihang Qiu、Chen-Chen Li、Jian Gao、Chao-Jun Li
DOI:10.1021/acscatal.8b01224
日期:2018.5.4
cross-coupling to construct the C(sp2)–C(sp3) bond was developed from two sustainable biomass-based feedstocks: phenolderivatives with umpolung aldehydes. This strategy features the in situ generation of moisture/air-stable hydrazones from naturally abundant aldehydes, which act as alkyl nucleophiles under catalysis to couple with readily available phenolderivatives. The avoidance of using both halides
Copper-Catalyzed Regioselective C-H Sulfonyloxylation of Electron-Rich Arenes with <i>p</i>-Toluenesulfonic Acid and Sulfonyloxylation of Aryl(mesityl)iodonium Sulfonates
Copper-catalyzed regioselective C-H sulfonyloxylation of electron-rich arenes with p-toluenesulfonic acid has been developed. Electron-rich benzene derivatives and heteroarenes can undergo this C-H sulfonyloxylation reaction to generate aryl tosylates. Furthermore, sulfonyloxylation of aryl(mesityl)iodonium sulfonates has also been investigated. Both aryl(mesityl)iodonium tosylates and triflates can