Enantioselective Nucleophilic Opening of meso Epoxides by Organolithium Reagents

Abstract
Aryl lithium reagents, complexed with (-)-sparteine, react enantioselectively with cyclic meso epoxides, to afford chiral aryl cyclanols. The enantiomeric excess, though moderate (27-87%), is the best in the literature for such a reaction. Activation by BF3 ⋅ OEt2 is needed, and is compatible with a diamine such as (-)-sparteine.

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