A new type of allylation: synthesis of β,γ-unsaturated ketones from α-halogenated aryl ketones using an allyltributyltin(IV)–tin(II) dichloride–acetonitrile system
作者:Makoto Yasuda、Makihiro Tsuchida、Akio Baba
DOI:10.1039/a708679b
日期:——
Allylation of α-halogenated aryl ketones with an allyltributyltinâtin dichlorideâacetonitrile system gave β,γ-unsaturated ketones in high yields via selective aryl rearrangement.
A method is described for carrying out indium-mediatedallylation reactions of phenacyl bromides in aqueous solution that form homoallylic bromohydrins. By employing subsequent base treatment, the homoallylic bromohydrins were converted to allylic epoxides. Finally, the process has been used as a key step in a concise sequence for the synthesis of 3-allylbenzofuran.