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。
Solvent-free palladium-catalyzed C–O cross-coupling of aryl bromides with phenols
作者:Sergey A. Rzhevskiy、Maxim A. Topchiy、Vasilii N. Bogachev、Lidiya I. Minaeva、Ilia R. Cherkashchenko、Konstantin V. Lavrov、Grigorii K. Sterligov、Mikhail S. Nechaev、Andrey F. Asachenko
DOI:10.1016/j.mencom.2021.04.042
日期:2021.5
A new solvent-free procedure for C–O cross-coupling between phenols and aryl bromides comprising of Pd2(dba)3/ButBrettPhos catalytic system is efficient for substrates bearing donor or acceptor, as well as bulky substituents.
Green alternative solvents for the copper-catalysed arylation of phenols and amides
作者:Carlo Sambiagio、Rachel H. Munday、A. John Blacker、Stephen P. Marsden、Patrick C. McGowan
DOI:10.1039/c6ra02265k
日期:——
for the Cu-catalysed arylation of phenols and amides is reported. Alkyl acetates proved to be efficient solvents in the catalytic processes, and therefore excellent alternatives to the typical non-green solvents used for Cu-catalysed arylationreactions. Solvents such as isosorbide dimethyl ether (DMI) and diethyl carbonate also appear to be viable possibilities for the arylation of phenols. Finally
A New Biarylphosphine Ligand for the Pd-Catalyzed Synthesis of Diaryl Ethers under Mild Conditions
作者:Luca Salvi、Nicole R. Davis、Siraj Z. Ali、Stephen L. Buchwald
DOI:10.1021/ol202955h
日期:2012.1.6
A new bulky biarylphosphine ligand (L8) has been developed that allows the Pd-catalyzed C–O cross-coupling of a wide range of aryl halides and phenols undermilderconditions than previously possible. A direct correlation between the size of the ligand substituents in the 2′, 4′, and 6′ positions of the nonphosphine containing ring and the reactivity of the derived catalyst system was observed. Specifically
The present invention relates to compounds of formula (I): or pharmaceutically acceptable salts or mixture thereof that inhibit serine protease activity, particularly the activity of hepatitis C virus NS3-NS4A protease.