Reported herein is a novel visible‐light photoredox system with Pd(PPh3)4 as the sole catalyst for the realization of the first direct cross‐coupling of C(sp3)−H bonds in N‐aryl tetrahydroisoquinolines with unactivated alkyl bromides. Moreover, intra‐ and intermolecular alkylations of heteroarenes were also developed under mild reaction conditions. A variety of tertiary, secondary, and primary alkyl
Palladium-Catalyzed C–H Activation/Cross-Coupling of Pyridine <i>N</i>-Oxides with Nonactivated Secondary Alkyl Bromides
作者:Bin Xiao、Zhao-Jing Liu、Lei Liu、Yao Fu
DOI:10.1021/ja3113752
日期:2013.1.16
activation/C-C cross-coupling reaction has been found to occur between pyridine N-oxides and general nonactivated secondary and even tertiary alkylbromides. It provides a practically useful approach for the synthesis of alkylated pyridine derivatives. Experimental observations indicated that the C-Br cleavage step involves a radical-type process. Thus, the title reaction provides a rather extraordinary
Photocatalytic decarboxylative alkylations of C(sp3)-H and C(sp2)-H bonds enabled by ammonium iodide in amide solvent
作者:Guang-Zu Wang、Ming-Chen Fu、Bin Zhao、Rui Shang
DOI:10.1007/s11426-020-9905-1
日期:2021.3
A simple ammonium iodide salt in amide solvent catalyzes regioselective decarboxylative alkylation of C(sp3)-H bonds of N-aryl glycine derivatives, of C(sp2)-H bond of heteroarenes, and cascade radical addition to unsaturated bond followed by intramolecular addition to arene, with a broad scope of N-hydroxyphthalimide derived redox active esters under visible light irradiation. The reactions are suggested
Irradiation-Induced Palladium-Catalyzed Direct C–H Alkylation of Heteroarenes with Tertiary and Secondary Alkyl Bromides
作者:Rui Shang、Yao Fu、Guang-Zu Wang
DOI:10.1055/s-0036-1592000
日期:2018.8
Published as part of the Special Topic Modern Radical Methods and their Strategic Applications in Synthesis Abstract A palladium catalyst in combination with two types of phosphine ligands efficiently catalyzes direct C–H alkylation of heteroarenes with secondary and tertiary alkyl bromides under irradiation conditions. Irradiation of blue light-emitting diodes (blue LEDs) effectively excites phosphine-ligated