C-H BONDS;
CROSS-COUPLING REACTIONS;
CARBON-HYDROGEN BONDS;
DIRECT ARYLATION;
ORGANOMETALLIC COMPLEXES;
DIRECT FUNCTIONALIZATION;
ARYL CHLORIDES;
ACTIVATION;
PALLADIUM;
ARENES;
D O I:
10.1021/ja208286b
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
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.