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Synthesis of Janus All-Cis Tetrafluorocyclohexanes Carrying 1,4-Diether Motifs
Thomas J Poskin1, Bruno A Piscelli2, Aidan P McKay1
1School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, U.K.
Abstract:
Nucleophilic aromatic substitutions (SNAr) of alkoxides on pentafluoroaryl ethers are explored as a first step in a synthesis sequence to generate all-cis 2,3,5,6-tetrafluorocyclohexyl-1,4-dialkyl ethers 1. The SNAr reaction was explored both experimentally and theoretically to rationalize ortho/para/meta selectivities. tert-Butyl deprotection of products followed by phenol alkylations introduces versatility to the synthesis. The final Rh(CAAC) 3 catalyzed aryl hydrogenation step of intermediate tetrafluoroaryl-1,4-diethers generated cyclohexane products 1. This chemistry introduces a new class of Janus fluorocyclohexane derivatives with ether substituents placed 1,4- to each other.
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