Palladium-Catalyzed Direct C−H Arylation of <i>N</i>-Iminopyridinium Ylides: Application to the Synthesis of (±)-Anabasine
作者:Alexandre Larivée、James J. Mousseau、André B. Charette
DOI:10.1021/ja710073n
日期:2008.1.1
Palladium-catalyzed direct C-H arylation of N-iminopyridinium ylides provides a powerful and versatile method for the synthesis of functionalized piperidines in good yields. Chemoselective functionalization of the pyridinium ring in the presence of a pyridine substituent is possible as exemplified by the expedient synthesis of anabasine in 61% overall yield over three steps.
coupled with aryl bromides in the presence of an iron catalyst, metallic magnesium, a diamine ligand and an organic dihalide oxidant at 0 °C. The use of a 1:1 mixture of tetrahydrofuran and 1,4‐dioxane is essential for this CH bond activation reaction. The reaction has wider scope of the substrate compared with the reaction using a separately prepared Grignard reagent, and proceeds with lower catalyst
Regioselectivity in Palladium-Catalyzed C−H Activation/Oxygenation Reactions
作者:Dipannita Kalyani、Melanie S. Sanford
DOI:10.1021/ol051486x
日期:2005.9.1
[reaction: see text] Palladium-catalyzeddirectedC-Hactivation/oxygenation reactions have been explored in a series of meta-substituted aryl pyridine and aryl amide derivatives. These transformations tolerate a diverse array of electron-donating and electron-withdrawing meta-substituents and generally proceed with high levels of regioselectivity for functionalization of the less sterically hindered
We have developed a mild and efficient protocol for the ligand-free and heterogeneous Pd/C-catalyzed hetero SuzukiâMiyaura coupling reaction that allows for the synthesis of both heteroarylâaryl and heteroarylâheteroaryl derivatives in good to excellent yields.
Robust cyclometallated Ir(iii) catalysts for the homogeneous hydrogenation of N-heterocycles under mild conditions
作者:Jianjun Wu、Jonathan H. Barnard、Yi Zhang、Dinesh Talwar、Craig M. Robertson、Jianliang Xiao
DOI:10.1039/c3cc44567d
日期:——
Cyclometallated Cp*Ir(N∧C)Cl complexes derived from N-aryl ketimines are highly active catalysts for the reduction of N-heterocycles under ambient conditions and 1 atm H2 pressure. The reaction tolerates a broad range of other potentially reducible functionalities and does not require the use of specialised equipment, additives or purified solvent.