Divergent synthesis of chiral spiro (isoxazole–isoxazoline) hybrid ligands
摘要:
An efficient synthetic method for chiral (isoxazole-isoxazoline) ligands based on a spiro[4.5]decane framework has been developed. A variety of enantiomerically pure ligands were readily prepared via the Suzuki-Miyaura coupling. The palladium complexes of these ligands have proven to be effective catalysts for the asymmetric Wacker-type cyclization of an alkenyl alcohol. (C) 2008 Elsevier Ltd. All rights reserved.
Design and synthesis of chiral hybrid spiro (isoxazole–isoxazoline) ligands
摘要:
Novel chiral hybrid ligands containing an unsymmetrical spiro[4.5]decane skeleton with isoxazole and isoxazoline as the two coordinating units have been synthesized. Pd complexes of these ligands were found to be effective in activating olefins towards enantioselective tandem cyclization of a dialkenyl alcohol, providing the cyclized products in up to 97% ee. (c) 2007 Elsevier Ltd. All rights reserved.