Aryne-mediated fluorination: Synthesis of fluorinated biaryls via a sequential desilylation–halide elimination–fluoride addition process
作者:Vincent Diemer、Juan Sanz Garcia、Frédéric R. Leroux、Françoise Colobert
DOI:10.1016/j.jfluchem.2011.02.017
日期:2012.2
An unusual aryne-mediated fluorination of aromatic ring systems during the desilylation of ortho-bromo-biphenyl-trimethylsilanes with tetrabutylammonium fluoride (TBAF) is described. In situ formation of an aryne and addition of fluoride affords fluorinated biphenyls. The structures have been undoubtfully confirmed by synthesis of authentic samples via Suzuki–Miyaura cross-coupling and X-ray analysis
Regioselectivity in the Aryne Cross-Coupling of Aryllithiums with Functionalized 1,2-Dibromobenzenes
作者:Vincent Diemer、Manon Begaud、Frédéric R. Leroux、Françoise Colobert
DOI:10.1002/ejoc.201001283
日期:2011.1
Tri- and tetrasubstituted ortho-bromobiaryls have been synthesized in good-to-excellent yields by arynecross-coupling reactions starting from 1,3-dimethoxybenzene and functionalized1,2-dibromobenzenes. This study outlines the influence of the 1,2-dibromobenzene precursor as well as the reaction temperature on the outcome of the aryl-aryl bond formation and indicates, in the case of dissymmetrical