Enhanced Reactivity of [Hydroxy(tosyloxy)iodo]benzene in Fluoroalcohol Media. Efficient Direct Synthesis of Thienyl(aryl)iodonium Salts

doi:10.3390/molecules15031918

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Molecules 2010, 15(3), 1918-1931; doi:10.3390/molecules15031918

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Enhanced Reactivity of [Hydroxy(tosyloxy)iodo]benzene in Fluoroalcohol Media. Efficient Direct Synthesis of Thienyl(aryl)iodonium Salts

Motoki Ito ¹, Chieko Ogawa ¹, Nobutaka Yamaoka ², Hiromichi Fujioka ¹, Toshifumi Dohi ^1,2 and Yasuyuki Kita ²^,*

¹ Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, Japan ² College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga, Japan

* Author to whom correspondence should be addressed.

Received: 3 February 2010; in revised form: 15 March 2010 / Accepted: 16 March 2010 / Published: 17 March 2010

(This article belongs to the Special Issue Advances in Heterocyclic Chemistry)

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Abstract: In this manuscript, we report clear evidence for the generation of aromatic cation radicals produced by using [hydroxy(tosyloxy)iodo]benzene (HTIB) in fluoroalcohol solvents such as 2,2,2-trifluoroethanol (TFE) and 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP). The single-electron-transfer (SET) oxidation ability of HTIB to give cation radicals was first established by ESR and UV measurements. The reaction was broadly applied to various thiophenes, and unique thienyliodonium salts were directly synthesized by this method in excellent yields without the production of any harmful byproducts.

Keywords: [hydroxyl(tosyloxy)iodo]benzene; fluoroalcohol solvents; diaryliodonium salts; thiophenes; single-electron-transfer

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MDPI and ACS Style

Ito, M.; Ogawa, C.; Yamaoka, N.; Fujioka, H.; Dohi, T.; Kita, Y. Enhanced Reactivity of [Hydroxy(tosyloxy)iodo]benzene in Fluoroalcohol Media. Efficient Direct Synthesis of Thienyl(aryl)iodonium Salts. Molecules 2010, 15, 1918-1931.

AMA Style

Ito M., Ogawa C., Yamaoka N., Fujioka H., Dohi T., Kita Y. Enhanced Reactivity of [Hydroxy(tosyloxy)iodo]benzene in Fluoroalcohol Media. Efficient Direct Synthesis of Thienyl(aryl)iodonium Salts. Molecules. 2010; 15(3):1918-1931.

Chicago/Turabian Style

Ito, Motoki; Ogawa, Chieko; Yamaoka, Nobutaka; Fujioka, Hiromichi; Dohi, Toshifumi; Kita, Yasuyuki. 2010. "Enhanced Reactivity of [Hydroxy(tosyloxy)iodo]benzene in Fluoroalcohol Media. Efficient Direct Synthesis of Thienyl(aryl)iodonium Salts." Molecules 15, no. 3: 1918-1931.

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