A general, mild and efficient palladium-catalyzed 2,2,2-trifluoroethoxylation of activated aryl bromides and bromo-chalcones: bromo-chalcones a new coupling partner in cross-coupling reaction
作者:T.M. Rangarajan、Kavita Devi、Ayushee、Ashok K. Prasad、Rishi Pal Singh
DOI:10.1016/j.tet.2015.08.071
日期:2015.10
2-trifluoroethoxylation of activated aryl bromides and bromo-chalcones has been developed. We unveil a fascinating insight into the Pd-catalyzed C–O cross-coupling reaction. Pd/tBuXPhos (L1) ligand system facilitates the C–O cross-coupling reaction between 2,2,2-trifluoroethanol and activated aryl bromides at both higher (115 °C) and lower temperatures (40 °C). Unprecedentedly, this catalyst system facilitates the
Synthesis of novel chalcones through palladium-catalyzed C O cross-coupling reaction of bromo-chalcones with ethyl acetohydroxamate and their antiplasmodial evaluation against Plasmodium falcipuram in vitro
作者:Reeta、Rajendran Vinoth、T.M. Rangarajan、Ayushee、Rishi Pal Singh、Manjula Singh
DOI:10.1016/j.bioorg.2019.02.016
日期:2019.5
An efficient method for palladium-catalyzed CO cross-coupling of ethyl acetohydroxamate (EAcHO) with 4-bromo-chalcones has been developed to synthesize novel chalcones. The two supporting ligands, namely tBuXPhos (L7), and cataCXium®PIntB (L16) were found to be effective ligands towards the Pd-catalyzed CO cross-coupling reaction to afford the desired product in moderate to excellent yields (50-99%)
Synthesis of Functionalized Cyclopentenes through Catalytic Asymmetric [3+2] Cycloadditions of Allenes with Enones
作者:Jonathan E. Wilson、Gregory C. Fu
DOI:10.1002/anie.200503312
日期:2006.2.20
A general and efficient Pd-catalyzed rapid 2-fluoroethoxylation of bromo-chalcones
作者:T.M. Rangarajan、Kavita Devi、Akhilesh K. Verma、Rishi Pal Singh、Raj Pal Singh
DOI:10.1016/j.jfluchem.2016.04.013
日期:2016.6
An efficient unprecedented Pd-catalyzed rapid 2-fluoroethoxylation of bromo-chalcones has been unveiled. The oxygen nucleophiles (fluoroalcohols) experience the rapid C-O bond forming reaction for the first time, albeit the alcohols are known to be a weak nucleophile and have greater competing beta-hydride elimination in the transition-metal-catalyzed (especially Pd and Cu) C-O cross-coupling reaction. The higher fluoroalcohols have also been effectively coupled with bromo-chalcones with relatively lower rate. (C) 2016 Elsevier B.V. All rights reserved.
Efficient solvent- and temperature-tuned access to aldoxime ethers and phenolic functions by Pd-catalyzed C–O cross-coupling of aldoximes with aryl bromides and bromo-chalcones
作者:Reeta Reeta、T. M. Rangarajan、Kumar Kaushik、Rishi Pal Singh、Manjula Singh、Raj Pal Singh
DOI:10.1039/c9nj05124d
日期:——
A single method with a functionality switching option was developed for the first time for the Pd-catalyzed C–O cross-coupling of aryl bromides and bromo-chalcones with aldoximes. The ligand tBuXPhos (L2) was found to be an effective supporting ligand for the Pd-catalyzedcoupling of aldoximes with bromo coupling partners. The functionality switching from oxime ethers to a phenolic or hydroxy group