general alkylation of heterocycles using a simple palladium catalyst is reported. Most classes of heterocycles, including indoles and pyridines, efficiently coupled with unactivated secondary and tertiary alkylhalides. An alkyl radical addition to neutral heteroarenes is most likely involved.
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