A Pd-catalyzed optional approach for the synthesis of dibenzothiophenes
作者:Juan Song、Hao Wu、Wei Sun、Songjiang Wang、Haisen Sun、Kang Xiao、Yan Qian、Chao Liu
DOI:10.1039/c8ob00235e
日期:——
A direct and practical approach for the construction of DBTs was developed via a Pd-catalyzed tandem reaction, in which commercially available o-bromo-iodobenzenes combined with benzene thiols or iodobenzenes combined with o-bromo-benzene thiols were applied. These two approaches will provide an alternative for the synthesis of DBT derivatives.
Formation of dibenzofurans by flash vacuum pyrolysis of aryl 2-(allyloxy)benzoates and related reactions
作者:Michael Black、J. I. G. Cadogan、Hamish McNab
DOI:10.1039/c002480e
日期:——
Flashvacuumpyrolysis (FVP) of aryl 2-(allyloxy)benzoates 5 and of the corresponding aryl 2-(allylthio)benzoates 6 at 650 °C, gives dibenzofurans 19 and dibenzothiophenes 20, respectively. The mechanism involves generation of phenoxyl (or thiophenoxyl) radicals by homolysis of the O-allyl (or S-allyl) bond, followed by ipso attack at the ester group, loss of CO2 and cyclisation of the resulting aryl
Gas phase generation and cyclisation reactions of some o-substituted phenyl radicals
作者:J.I.G. Cadogan、H.Susan Hutchison、Hamish McNab
DOI:10.1016/s0040-4020(01)90385-0
日期:1992.9
Flashvacuumpyrolysis of the allyl esters 2 (XO,S, CH2, CO) at 900°C (10−2 Torr) gives dibenzofurans, dibenzothiophenes, fluorenes, and fluorenones respectively as the major products. The mechanism involves the phenyl radical intermediates 1 which equilibrate by intramolecular hydrogen transfer via six-membered transition states, prior to cyclisation.
Rhodium-Catalyzed Sequential Dehydrogenation/Deoxygenation in One-Pot: Efficient Synthesis of Dibenzothiophene Derivatives from Diaryl Sulfoxides
作者:Qiufeng Huang、Shurong Fu、Shaojia Ke、Hanbing Xiao、Xiaofeng Zhang、Shen Lin
DOI:10.1002/ejoc.201501075
日期:2015.10
A novel strategy for the synthesis of dibenzothiophene derivatives is established through a one-pot intramolecular cross-dehydrogenative-coupling reaction of diaryl sulfoxides followed by deoxygenation with a Rh/Ag catalytic system. The yields obtained were good to excellent (up to 96 %), therefore making the described protocol an attractive option for building dibenzothiophene compounds.
Iron‐catalyzed carbon–sulfur bond formation: Atom‐economic construction of thioethers with diaryliodonium salts
作者:Li Liu、Jian Qiang、Shuhua Bai、Yang Li、Jian Li
DOI:10.1002/aoc.3810
日期:2017.11
Diaryliodonium salts are characterized by poor atom economy with the formation of one equivalent of an iodoarene as waste. We have developed an atom‐economic iron‐catalyzed protocol for the synthesis of a variety of thioethers with diaryliodonium salts. Not only cyclic diaryliodonium salts but also linear diaryliodonium salts were found to perform well in the reactions.