Copper catalyzed oxidative ortho-C–H benzoxylation of 2-phenylpyridines with benzyl alcohols and benzyl amines as benzoxylation sources
作者:Ashok B. Khemnar、Bhalchandra M. Bhanage
DOI:10.1039/c4ob01912a
日期:——
An efficient methodology for the ortho benzoxylation of 2-phenylpyridine via C–H bond activation using benzyl alcohols and benzyl amines as arylcarboxy sources has been developed.
A palladium-catalyzed direct C–H bond oxidativeacyloxylation of 2-arylpyridines with aromatic carboxylic acids is described. Several 2-arylpyridines derivatives and aromatic carboxylic acids participate in the reaction, providing a series of mono-acyloxylated products in moderate to good yields. Importantly, the reaction can be conducted without using any ligands in a lower temperature.
A domino oxidation-acyloxylation reaction of 2-arylpyridines with aldehydes or methylarenes under the catalysis of Cu(OAc)2 has been developed. The strategy via C-H bond functionalization has the advantages of good functional-group tolerance, high ortho regioselectivity and no need of any ligand or additive.