A Novel Synthetic Route to 2-Arylalkanoic
Acids by a Ruthenium-Catalyzed Chemoselective Oxidation of Furan
Rings

Masahiro Noji; Haruka Sunahara; Ken-ichi Tsuchiya; Tôru Mukai; Ayako Komasaka; Keitaro Ishii

doi:10.1055/s-0028-1083222

PAPER

A Novel Synthetic Route to 2-Arylalkanoic Acids by a Ruthenium-Catalyzed Chemoselective Oxidation of Furan Rings

Masahiro Noji, Haruka Sunahara, Ken-ichi Tsuchiya, Tôru Mukai, Ayako Komasaka, Keitaro Ishii*
Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
Fax: +81(42)4958783; e-Mail: ishiikei@my-pharm.ac.jp;

Abstract

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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

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