Asymmetric Reduction of Ketones with B-(cis-10-Pinanyl)-9-borabicyclononane. Observation of a Change in Enantioselection between Similar Organoborane and Organoaluminium Reagents

Article abstract of DOI:10.1021/jo00195a059

The title reagent reduces prochiral ketones of moderate steric bulk in modest to good enantiomeric excesses of the S alcohols.The absolute configuration is the opposite of that obtained with a similar organoaluminium reagent.