An efficient ligand-free Pd(OAc)2-catalyzed selectivearylation of pyridine N-oxides using potassium (hetero)aryltrifluoroborates as coupling partners via C–H bond activation was achieved in the presence of TBAI. This approach has a broad substrate scope and shows moderate to high yields.
Decarboxylative Arylation of Pyridine 1-Oxides and Anilides with Benzoic Acid via Palladium-Catalyzed C-H Functionalization
作者:Minoo Dabiri、Seyed Iman Alavioon、Siyavash Kazemi Movahed
DOI:10.1002/ejoc.201801373
日期:2019.2.21
A novel method for palladium‐catalyzed decarboxylative ortho C–H bond arylation of pyridine 1‐oxides and anilides with benzoic acids as aryl sources are described.
本文介绍了一种新颖的钯-氧化物和苯甲酰苯与苯甲酸作为芳基来源的钯催化脱羧邻C-H键芳基化的新方法。
Copper-catalyzed direct C–H arylation of pyridine N-oxides with arylboronic esters: one-pot synthesis of 2-arylpyridines
Copper-catalyzed direct C–H arylation of pyridineN-oxides with arylboronic esters for the one-pot synthesis of 2-arylpyridines without an additional reductant.
moiety followed by β-C elimination strategy was less studied. Here a palladium-catalyzed C–C bond activation of an unstrained ketone enabled by a removable directing group through β-C elimination to synthesize 2-arylpyridine is described. The protocol features wide substrate scope with yields up to 95%, good functional group tolerance, and functionality of natural products. The 2-arylpyridine N-oxide