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DOI: 10.1055/s-0030-1258223
m-Iodosylbenzoic Acid as a Convenient Recyclable Hypervalent Iodine Oxidant for the Synthesis of α-Iodo Ketones by Oxidative Iodination of Ketones
Publikationsverlauf
Received
9 June 2010
Publikationsdatum:
20. August 2010 (online)


Abstract
A convenient procedure for the preparation of α-iodo ketones by oxidative iodination of ketones using iodine and m-iodosylbenzoic acid as a recyclable hypervalent iodine oxidant is reported. Various ketones and β-dicarbonyl compounds can be iodinated by this reagent system under mild conditions affording the respective α-iodo-substituted carbonyl compounds in excellent yields. The final products of iodination are conveniently separated from byproducts by simple treatment with anionic exchange resin Amberlite IRA 900 HCO3 - and are isolated with good purity after evaporation of the solvent. The reduced form of the hypervalent iodine oxidant, m-iodobenzoic acid, can be recovered in 91-95% yield from the Amberlite resin by treatment with aqueous hydrochloric acid followed by extraction with ethyl acetate.
Key words
halogenation - iodine - ketones - iodosylbenzene - m-iodosylbenzoic acid - hypervalent iodine