A highly efficient and regioselectivedirectC–H trifluoromethylation of pyridine based on an N-methylpyridine quaternary ammonium activation strategy has been developed. A variety of trifluoromethylpyridines can be obtained in good yield and excellent regioselectivity by treating the pyridinium iodide salts with trifluoroacetic acid in the presence of silver carbonate in N,N-dimethylformamide. The
Reactivity of 4-Methylpyridinium Salts in a New Reaction of Ring Transformation of Pyridine and Isoquinoline Derivatives
作者:S. P. Gromov、M. V. Fomina、Yu. B. Grishina、N. A. Kurchavov
DOI:10.1007/s11178-006-0018-8
日期:2005.11
Dependence of reactivity on substituents in the pyridine ring of the 4-methylpyridinium salts was studied in intermolecular reaction of ring transformation involving quaternary salts of pyridinium and isoquinolinium promoted by methylammonium sulfite.