Amides and Ethers as Chemoselective Surrogates for Copper(II)-Catalyzed ortho Benzoyloxylation of 2-Phenylpyridines
摘要:
Chemoselective ortho benzoyloxylation of 2-phenylpyridine derivatives using amides and ethers as novel arylcarboxy sources using a Cu(II)/TBHP catalytic system has been reported. It is a simple protocol for ortho benzoyloxylation using amides and ethers as surrogates. A broad range of amides and ethers was found to be compatible under optimized reaction conditions to provide the corresponding products in good to excellent yield. The reaction proceeds through the cleavage of C-N, C-O, and C-H bonds and the formation of a new C-O bond via C-H functionalization.
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.
Benzylamine as an arylcarboxy surrogate: a copper catalysed o-benzoxylation of 2-phenylpyridines using benzyl amines
作者:Ahalya Behera、Saroj K. Rout、Srimanta Guin、Bhisma K. Patel
DOI:10.1039/c4ra09922b
日期:——
Different reactivities and selectivities of Cu and Pd catalysts have been demonstrated in the reactions of benzylamines with 2-phenylpyridines.
铜和钯催化剂在苄胺与2-苯基吡啶反应中表现出不同的活性和选择性。
Terminal Aryl Alkenes and Alkynes as Arylcarboxy Surrogates toward <i>o</i>-Benzoxylation of 2-Phenylpyridine Catalyzed by Copper
作者:Saroj Kumar Rout、Srimanta Guin、Anupal Gogoi、Ganesh Majji、Bhisma K. Patel
DOI:10.1021/ol500224e
日期:2014.3.21
A variety of styrenes and phenylacetylenes serve as excellent arylcarboxy sources in bringing about substrate directed o-benzoxylation of 2-phenylpyridine derivatives catalyzed by Cu(II) in the presence of TBHP. This reaction proceeds via formation of phenylglyoxal followed by decarbonylation to benzoyl radical/benzaldehyde which acts as the arylcarboxy source.