title: Synthesis of fluorinated fused benzofurans and benzothiophenes: Smiles-type rearrangement and cyclisation of perfluoro(het)aryl ethers and sulfides.
abstract: Lithium-bromine exchange in 2-bromophenyl perfluoroaryl ethers or sulfides affords fused fluorinated benzofurans or benzothiophenes respectively by S(N)Ar substitution of the adjacent fluorine in the perfluoroaryl substituent. The structures of the new compounds were confirmed by NMR spectroscopy and single crystal X-ray diffraction analysis. In the case of 2-bromophenyl tetrafluoropyrid-4-yl ether, lithiation promoted a Smiles-type rearrangement which led to formation of 4-(2-hydroxyphenyl)tetrafluoropyridine, for which the structure was confirmed by X-ray crystallography.
authors.affiliation: Department of Chemistry, Loughborough University, Loughborough, UK LE11 3TU.
authors.forename: Julia
authors.initials: J
authors.lastname: Ponce González
authors.forename: Mark
authors.initials: M
authors.lastname: Edgar
authors.forename: Mark R J
authors.initials: MR
authors.lastname: Elsegood
authors.forename: George W
authors.initials: GW
authors.lastname: Weaver