Biphenyl-2-ols undergo regioselectivemono- and diarylation upon a treatment with aryl iodides in the presence of a palladium catalyst in DMF using Cs2CO3 as a base to produce 1,1′ : 2′,1″-terphenyl-2-ol and 2′,6′-diphenylbiphenyl-2-ol and their derivatives. The reaction of 1-naphthol selectively occurs at its 8-position to give 8-aryl-1-naphthols. In the reaction of 2-naphthol with aryl bromides, diarylated
Microwave-Promoted Pd-Catalyzed Synthesis of Dibenzofurans from<i>Ortho</i>-Arylphenols
作者:Bernd Schmidt、Martin Riemer
DOI:10.1002/jhet.2704
日期:2017.3
ortho‐Aryl phenols, synthesized via protecting group free Suzuki–Miyaura coupling of ortho‐halophenols and arene boronic acids, undergo a cyclization to dibenzofurans via oxidative C–H activation. The reaction proceeds under microwave irradiation in short reaction times using catalytic amounts of Pd(OAc)2 without additional ligands.
Copper-catalyzed oxidative aromatization of 2-cyclohexen-1-ones to phenols in the presence of catalytic hydrogen bromide under molecular oxygen
作者:Kotaro Kikushima、Yuta Nishina
DOI:10.1039/c3ra43071e
日期:——
Catalytic oxidative aromatization has been achieved using 2-cyclohexen-1-ones to obtain phenol derivatives in the presence of a catalytic amount of copper salt and aqueous HBr under molecular oxygen. The amount of HBr was successfully reduced to a catalytic quantity, and the other additive such as a ligand and an oxidant as well as inert conditions were unnecessary. Various mono-, di-, and trisubstituted
A novel 4-aminoantipyrine-Pd(II) complex catalyzes Suzuki–Miyaura cross-coupling reactions of aryl halides
作者:Claudia Araceli Contreras-Celedón、Darío Mendoza-Rayo、José A Rincón-Medina、Luis Chacón-García
DOI:10.3762/bjoc.10.299
日期:——
efficient catalytic system based on a Pd complex of 4-aminoantipyrine, 4-AAP-Pd(II), was found to be highly active for Suzuki-Miyaura cross-coupling of aryl iodides and bromides with phenylboronic acids under mild reaction conditions. Good to excellent product yields from the cross-couplingreaction can be achieved when the reaction is carried out in ethanol, in the open air, using lowloading of 4-AAP-Pd(II)