Aryl lithium reagents, complexed with (-)-sparteine, react enantiosele
ctively with cyclic meso epoxides, to afford chiral aryl cyclanols. Th
e enantiomeric excess, though moderate (27-87%), is the best in the li
terature for such a reaction. Activation by BF3. OEt2 is needed, and i
s compatible with a diamine such as (-)-sparteine.