Oxidative Cyclization of 2-Arylphenols to Dibenzofurans under Pd(II)/Peroxybenzoate Catalysis
摘要:
2-Arylphenols undergo intramolecular C-H bond activation/C-O bond formation to afford dibenzofuran derivatives under palladium catalysis In the presence of tert-butyl peroxybenzoate as an oxidant. Kinetic isotope effect experiments indicated that C-H bond cleavage Is the rate-limiting step of the reaction.
鉴于 2-羟基联芳基化合物在有机化学、药物化学和材料化学中的重要作用,合成这种常见基序的简明方法非常有价值。在寻求扩展合成化学家在这方面的词典时,我们开发了一种使用现成的硼酸对苯酚和萘酚进行邻位芳基化的权宜之计和通用策略。我们的方法依赖于通过伸缩的 B 到 Bi 转金属和氧化从工作台稳定的 Bi(III) 前体原位生成独特的反应性 Bi(V) 芳基化剂。通过利用与传统金属催化歧管正交的反应性,多种芳基和杂芳基伙伴可以在温和条件下与苯酚和萘酚快速偶联。芳基化后,Bi(III)前体的高产率回收允许其在后续反应中有效地重复使用。对该方法的每个关键步骤的机械询问为其实际应用提供了信息,并提供了对有机铋化合物未充分利用的反应性的基本见解。
Mechanisms of the Photochemical Rearrangement of Diphenyl Ethers
作者:Naoki Haga、Hiroaki Takayanagi
DOI:10.1021/jo9517196
日期:1996.1.1
The mechanism of the photochemical rearrangement of diphenyl ether (1a) was studied. Irradiation of 1a in ethanol gave 2-phenylphenol (2, 42%) and 4-phenylphenol (3, 11%) as rearrangement products, in addition to phenol (4, 30%) and benzene (5, 25%) as diffusion products. Cross-coupling experiments employing [(2)H(10)]1a demonstrated that the formation of 2- and 4-phenylphenol was an intramolecular
Sustainable H2O/ethyl lactate system for ligand-free Suzuki–Miyaura reaction
作者:Jie-Ping Wan、Chunping Wang、Rihui Zhou、Yunyun Liu
DOI:10.1039/c2ra21632a
日期:——
A sustainable catalyst system consisted of H2O/ethyl lactate (EL), Pd(OAc)2 and K2CO3 has been developed as a generally applicable protocol for SuzukiâMiyaura reactions using various aryl bromides and iodides to incorporate arylboronic acids under ligand-free conditions. This protocol is advantageous owing to the employment of water and non-toxic, biomass available ethyl lactate as green media. In addition, as a co-solvent with water, ethyl lactate displayed evident superiority over conventional polar organic solvents such as DMF, DMSO and dioxane etc., which implied the additional potential function of EL as a ligand in these reactions.
[EN] DERIVATIVES OF 6-SUBSTITUTED TRIAZOLOPYRIDAZINES AS REV-ERB AGONISTS<br/>[FR] DÉRIVÉS DE TRIAZOLOPYRIDAZINES 6-SUBSTITUÉES EN TANT QU'AGONISTES DE REV-ERB
申请人:GENFIT
公开号:WO2013045519A1
公开(公告)日:2013-04-04
The present invention provides novel 6-substituted [1,2,4]triazolo[4,3-b]pyridazines that are agonists of Rev-Erb. These compounds, and pharmaceutical compositions comprising the same, are suitable means for treating any disease wherein the activation of Rev-Erb has therapeutic effects, for instance in inflammatory and circadian rhythm-related disorders or cardiometabolic diseases.
An efficient water-soluble surfactant-type palladium catalyst for Suzuki cross-coupling reactions in pure water at room temperature
作者:Pei Qiu、Jing Yang Zhao、Xu Shi、Xin Hong Duan
DOI:10.1039/c6nj00377j
日期:——
An in situ-generated Pd catalyst with a bidentate phosphine-type zwitterionic surfactant as a ligand showed high catalytic activity in the Suzuki reactions.
一个以双齿膦型带电离表面活性剂为配体的原位生成的Pd催化剂在Suzuki反应中表现出高催化活性。
Pd(<scp>ii</scp>) catalyzed ortho C–H iodination of phenylcarbamates at room temperature using cyclic hypervalent iodine reagents
作者:Xiuyun Sun、Xia Yao、Chao Zhang、Yu Rao
DOI:10.1039/c5cc02533h
日期:——
The first example to access ortho iodinated phenols using cyclic hypervalent iodine(iii) reagents through palladium(ii) catalyzed C–H activation has been developed via weak coordination. The reaction showed excellent regioselectivity, reactivity and good functional group tolerance. A unique mechanism was proposed.