Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 174, Issue 1-2, Pages 151-157Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1381-1169(01)00198-4
Keywords
allylic alkylation; enantioselective; palladium catalyst; polymer-supported
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Chiral ferrocenylphosphine-imines A-D were synthesized and grafted to polystyrene to afford polymeric ligands PA-PD. Ligands A-D and PA-PD were used as ligands in the palladium-catalyzed asymmetric allylic alkylation. In the homogeneous reactions, the best result was obtained when the ligand A was used (99% yield and 82% ce). In the heterogeneous reactions, the highest ce value (73%) in the first run was obtained when PA was used as a ligand. Considering the enantioselectivity and reusability, the best result was obtained in the case of PC. The recycling of the polymer-supported pi -allylpalladium catalyst gave unsatisfactory results: it can be reused three times with moderate enantioselectivities (60-70% ee). (C) 2001 Elsevier Science B.V. All rights reserved.
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