One-pot synthesis of 2-substituted benzo[b]furans via Pd–tetraphosphine catalyzed coupling of 2-halophenols with alkynes
作者:Rong Zhou、Wei Wang、Zhi-jie Jiang、Kun Wang、Xue-li Zheng、Hai-yan Fu、Hua Chen、Rui-xiang Li
DOI:10.1039/c4cc00815d
日期:——
A catalyst composed of [Pd(η(3)-C3H5)Cl]2 and N,N,N',N'-tetra(diphenylphosphinomethyl)pyridine-2,6-diamine (L) was found to be effective for one-pot synthesis of 2-substitutedbenzo[b]furansfrom 2-halophenols and alkynes. For 2-bromo-3-hydroxypyridine, the catalyst loading could be as low as 1 ppm and the turnover number (TON) was up to 870,000.
One-pot Tandem Heck alkynylation/cyclization reactions catalyzed by Bis(Pyrrolyl)pyridine based palladium pincer complexes
作者:Seema Yadav、Chandrakanta Dash
DOI:10.1016/j.tet.2020.131350
日期:2020.7
Ligand assisted palladium catalyzed one-pot tandem Heck alkynylation/cyclization reactions for the synthesis of benzofurans was reported in this paper. Well-defined palladium-pincer complexes exhibited excellent catalytic activities for the one-pot tandem Heck alkynylation/cyclization reactions yielding benzofuran derivatives using 0.1 mol% catalyst. All the catalyticreactions are performed in air
A new, non‐symmetrical copper(II) pincercomplex catalyzes much more efficiently the formation of benzofuran by the reaction between ortho‐iodophenols and alkynes. The lowest catalyst loadings are realized for this reaction, and bromo‐ and chlorophenols are heteroannulated for the first time. Strong evidence for hydrophenoxylation and intramolecular halogen atom‐transfer steps catalyzed by this remarkably
success of the desulfitative Sonogashira cross-coupling reaction of thioamide-type pyridine derivatives and alkynes. Corresponding alkynylated products were obtained with moderate to excellent yields. Thanks to this reaction, furo[3,2-b]pyridine and 1H-pyrrolo[3,2-b]pyridine derivatives were synthesized through a one-pot cross-coupling reaction/heteroannulation sequence.
事实证明,邻位螯合辅助对于硫酰胺型吡啶衍生物和炔烃的脱硫Sonogashira交叉偶联反应的成功至关重要。以中等至优异的产率获得了相应的炔基化产物。由于该反应,通过一锅交叉偶联反应/杂环化序列合成了呋喃[3,2- b ]吡啶和1 H-吡咯并[3,2- b ]吡啶衍生物。
Hydroxyterphenylphoshine−Palladium Catalyst for Benzo[<i>b</i>]furan Synthesis from 2-Chlorophenols. Bifunctional Ligand Strategy for Cross-Coupling of Chloroarenes
作者:Jia-Rui Wang、Kei Manabe
DOI:10.1021/jo1007948
日期:2010.8.6
A catalyst composed of Pd and hydroxyterphenylphosphine was found to be effective for one-pot benzo[b]furan synthesis from 2-chlorophenols and alkynes.