Synthesis of fluorinated fused benzofurans and benzothiophenes: Smiles-type rearrangement and cyclisation of perfluoro(het)aryl ethers and sulfides
作者:Julia Ponce González、Mark Edgar、Mark R. J. Elsegood、George W. Weaver
DOI:10.1039/c0ob00790k
日期:——
Lithium–bromine exchange in 2-bromophenyl perfluoroaryl ethers or sulfides affords fused fluorinated benzofurans or benzothiophenes respectively by SNAr 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,
在2-溴苯基全氟芳基醚或硫化物中进行锂-溴交换,分别通过全氟芳基取代基中相邻氟的S N Ar取代,分别得到稠合的氟化苯并呋喃或苯并噻吩。通过NMR光谱和单晶X射线衍射分析证实了新化合物的结构。如果是2-溴苯基四氟吡啶-4-基醚,锂化促进了Smiles型重排,导致形成 4-(2-羟苯基)四氟吡啶,其结构通过X射线晶体学确认。