Journal
TETRAHEDRON
Volume 67, Issue 2, Pages 421-428Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2010.11.023
Keywords
Bicyclophosphanes; Palladium; Ionic liquids; Suzuki C-C cross-coupling; Allylic alkylation
Categories
Funding
- Centre National de la Recherche Scientifique
- UniversitePaul Sabatier
- Ministerio de Ciencia e Innovacionn [CTQ2007-63510PPQ, CSD2006-0003]
- Generalitat de Catalunya [CTP 2007ITT-00007]
- Generalitat de Catalunya
- European Social Fund [FI, BE2008]
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New azadioxaphosphabicyclo[3.3.0]octane ligands showing a trans arrangement with regard to the two five-membered heterocycles, were obtained as a mixture of three conformers, in agreement with molecular modelling studies. The stability of oxaphosphane ligands was studied under basic catalytic conditions, monitored by NMR spectroscopy. Palladium catalytic systems containing these ligands were active in Suzuki C-C cross-coupling reactions between phenylboronic acid and aryl halides (bromide and chloride derivatives) bearing electron-donor or electron-withdrawing substituents, in both organic and ionic liquid solvents. The catalytic systems showed a high stability even under the most severe reaction conditions used in this work. The ionic liquid catalytic phase could be recycled up to ten times without significant activity loss. (C) 2010 Elsevier Ltd. All rights reserved.
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