A novel atom-transfer cyclisation catalysed by indium metal in halogenated solvents
摘要:
Treatment of tethered alkyne-allyl halides 1a-d with indium metal in halogenated solvents affords carbocyclic vinyl halides (3a-d) via a novel atom-transfer reaction. The reactions are operationally facile and proceed smoothly at room temperature even with sub-stoichiometric quantities of the metal. Use of a halogenated solvent containing a different halide than that contained in the substrate affords a mixture of products arising from intramolecular halide transfer and abstraction of a halide atom from solvent. (C) 2004 Elsevier Ltd. All rights reserved.
New indium-mediated cyclisation reactions of tethered haloenynes in aqueous solvent systems
作者:Andres Goeta、Matthew M. Salter、Hummad Shah
DOI:10.1016/j.tet.2006.01.094
日期:2006.4
The intramolecular cyclisation of tethered allyl bromides onto terminal alkynes mediated by metallic indium proceeds smoothly and cleanly in mixtures of THF and H2O to give unsaturated carbocycles and heterocycles in good yield. Alternatively, the cyclisation may be carried out in anhydrous THF with the aid of acid catalysis. The reaction is also mediated by a range of indium salts and proceeds with
A novel atom-transfer cyclisation catalysed by indium metal in halogenated solvents
作者:Nadia H. Bhatti、Matthew M. Salter
DOI:10.1016/j.tetlet.2004.09.054
日期:2004.11
Treatment of tethered alkyne-allyl halides 1a-d with indium metal in halogenated solvents affords carbocyclic vinyl halides (3a-d) via a novel atom-transfer reaction. The reactions are operationally facile and proceed smoothly at room temperature even with sub-stoichiometric quantities of the metal. Use of a halogenated solvent containing a different halide than that contained in the substrate affords a mixture of products arising from intramolecular halide transfer and abstraction of a halide atom from solvent. (C) 2004 Elsevier Ltd. All rights reserved.