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DOI: 10.1055/s-0028-1083222
A Novel Synthetic Route to 2-Arylalkanoic Acids by a Ruthenium-Catalyzed Chemoselective Oxidation of Furan Rings
Publication History
Publication Date:
14 November 2008 (online)

Abstract
An efficient two-step synthesis of 2-arylalkanoic acids from 1-arylalkanols is described. Firstly, 1-arylalkylfuran derivatives were synthesized in high yields by the metal triflate catalyzed Friedel-Crafts alkylation of 2-methylfuran with 1-arylalkanols without employing anhydrous conditions. The chemoselective oxidation of the furan ring in 1-arylalkylfurans to carboxylic acid was then investigated. In a solvent system of hexane-EtOAc/H2O (1:3:4), the furan ring was selectively oxidized with 7 equivalents of NaIO4 by using 0.5 mol% RuCl3 as catalyst to give 2-arylalkanoic acids in good yields. The selectivity of ruthenium oxidation was controlled by the solvent ratio of hexane-EtOAc.
Key words
Friedel-Crafts alkylation - 1-arylalkylfurans - ruthenium tetroxide - chemoselective oxidation - carboxylic acids
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References
The use of HPLC-grade EtOAc or MS4A-treated (to adsorb EtOH) HPLC-grade EtOAc gave almost the same results.