Copper impregnated into charcoal efficiently catalyzes cross-couplings between aryl bromides and phenols. The etherifications were conveniently promoted by microwave heating.
Design, synthesis and biological evaluation of uncharged catechol derivatives as selective inhibitors of PTP1B
作者:Xiang-Qian Li、Qi Xu、Jiao Luo、Li-Jun Wang、Bo Jiang、Ren-Shuai Zhang、Da-Yong Shi
DOI:10.1016/j.ejmech.2017.05.007
日期:2017.8
obesity. However, the development of charged PTP1B inhibitors was restricted due to their low cell permeability and poor bioavailability. Based on active natural products, two series of uncharged catecholderivatives were identified as PTP1B inhibitors by targeting a secondary aryl phosphate-binding site as well as the catalytic site. The most potent inhibitor 22 showed an IC50 of 0.487 μM against PTP1B and
Diaryl Ether Formation Merging Photoredox and Nickel Catalysis
作者:Le Liu、Cristina Nevado
DOI:10.1021/acs.organomet.1c00018
日期:2021.7.26
Photoredox and Ni catalysis are combined to produce diaryl ethers under mild conditions. A broad range of aryl halides and phenol derivatives are cross-coupled in the presence of a readily available organic photocatalyst and NiBr2(dtbpy). Symmetrical diaryl ethers have also been directly obtained from aryl bromides in the presence of water. Mechanistic investigations support the involvement of Ni(0)
Isothiouronium salts as useful and odorless intermediates for the synthesis of thiaalkylimidazolium ionic liquids
作者:Gabriela I. Matiello、Alessandra Pazini、Kácris I.M. da Silva、Rafaela G.M. da Costa、Günter Ebeling、Jairton Dupont、Jones Limberger、Jackson D. Scholten
DOI:10.1016/j.tetlet.2019.02.013
日期:2019.3
simple and odorless route for the synthesis of monocationic and dicationic thiaalkylimidazolium ionic liquids (ILs) is reported. Our approach starts with the selective monoalkylation of dihalogenated substrates by methylimidazole derivatives, followed by the synthesis of odorless isothiouronium salts via reaction with thiourea. The target ILs are obtained after sequential hydrolysis-alkylation of the isothiouronium
Novel Electron-Rich Bulky Phosphine Ligands Facilitate the Palladium-Catalyzed Preparation of Diaryl Ethers
作者:Attila Aranyos、David W. Old、Ayumu Kiyomori、John P. Wolfe、Joseph P. Sadighi、Stephen L. Buchwald
DOI:10.1021/ja990324r
日期:1999.5.1
A general method for the palladium-catalyzed formation of diaryl ethers is described. Electron-rich, bulky aryldialkylphosphine ligands, in which the two alkyl groups are either tert-butyl or 1-adamantyl, are the key to the success of the transformation. A wide range of electron-deficient, electronically neutral and electron-rich aryl bromides, chlorides, and triflates can be combined with a variety
描述了钯催化形成二芳基醚的一般方法。富含电子的、庞大的芳基二烷基膦配体,其中两个烷基是叔丁基或 1-金刚烷基,是转化成功的关键。使用氢化钠或磷酸钾作为碱,在 100 °C 的甲苯中,可以将各种缺电子、电子中性和富电子的芳基溴化物、氯化物和三氟甲磺酸酯与各种酚结合。膦配体庞大而碱性的性质被认为是提高二芳基醚从钯中还原消除的速率的原因。
Nickel-Catalyzed Etherification of Phenols and Aryl Halides through Visible-Light-Induced Energy Transfer
作者:Da-Liang Zhu、Shan Jiang、Qi Wu、Hao Wang、Hai-Yan Li、Hong-Xi Li
DOI:10.1021/acs.orglett.1c03066
日期:2021.11.5
arylhalides, the ability of such a Ni-catalyzed transformation employing phenols to diaryl ethers is unsuccessful due to phenolates with much lower reduction potentials, which suppress the oxidation of nickel(II) intermediates into requisite Ni(III) species. We herein report visible-light-initiated, nickel-catalyzed O-arylation of phenols with arylhalides using t-BuNH(i-Pr) as the base and thioxanthen-9-one
尽管在链烷醇和芳基卤化物的镍催化醚化方面取得了一些进展,但由于苯酚盐的还原电位低得多,从而抑制了镍 (II) 中间体氧化成必需的化合物,因此这种使用苯酚的镍催化转化为二芳基醚的能力并不成功Ni(III) 物种。我们在此报告了在可见光下使用t- BuNH( i- Pr) 作为碱和thioxanthen -9-one 作为光敏剂的可见光引发的镍催化苯酚与芳基卤化物的O-芳基化。这种光电耦合表现出广泛的基板范围。