Sequential Chelation-Assisted Aromatic C–H Functionalisation via Catalytic meta Sulfonation
摘要:
The sequential functionalisation of 2-phenylpyridine is presented using selective ortho- and meta-directing processes. It was found that performing a reaction sequence with meta functionalisation first followed by ortho functionalisation provided novel reaction products in good yields and with complete regioselectivity.
Ruthenium-Catalyzed Meta Sulfonation of 2-Phenylpyridines
作者:Ourida Saidi、Jameel Marafie、Araminta E. W. Ledger、Po Man Liu、Mary F. Mahon、Gabriele Kociok-Köhn、Michael K. Whittlesey、Christopher G. Frost
DOI:10.1021/ja208286b
日期:2011.12.7
A selective catalytic meta sulfonation of 2-phenylpyridines was found to occur in the presence of (arene)ruthenium(II) complexes upon reaction with sulfonyl chlorides. The 2-pyridyl group facilitates the formation of a stable Ru-C-aryl sigma bond that induces a strong para-directing effect. Electrophilic aromatic substitution proceeds with the sulfonyl chloride to furnish a sulfone at the position meta to the chelating group. This new catalytic process offers access to atypical regioselectivity for reactions involving chelation-assisted cyclometalation.
Sequential Chelation-Assisted Aromatic C–H Functionalisation via Catalytic meta Sulfonation
The sequential functionalisation of 2-phenylpyridine is presented using selective ortho- and meta-directing processes. It was found that performing a reaction sequence with meta functionalisation first followed by ortho functionalisation provided novel reaction products in good yields and with complete regioselectivity.
Mechanistic insight into ruthenium catalysed meta-sulfonation of 2-phenylpyridine
作者:Patricia Marcé、Andrew J. Paterson、Mary F. Mahon、Christopher G. Frost
DOI:10.1039/c6cy01254j
日期:——
methodology in the last decade. We report herein structural and mechanistic studies of the meta-sulfonation of phenylpyridine using rutheniumcomplexes. Furthermore, we disclose that the catalytically active species does not require the presence of a η6-arene ligand. Furthermore, the novel cycloruthenated phenylpyridine complex tosylated at the para position to the metal has been isolated and fully characterised