The Corey-Itsuno Reduction, also known as the Corey-Bakshi-Shibata (CBS) reduction, is a chemical reaction in which an achiral ketone is enantioselectively reduced to produce the corresponding chiral, non-racemic alcohol. The oxazaborolidine reagent which mediates the enantioselective reduction of ketones

Enantioselective reduction of ketones

Enantioselective ketone reductions convert prochiral ketones into chiral, non-racemic alcohols and are used heavily for the synthesis of stereodefined alcohols.-Introduction:...

 was previously developed by the laboratory of Itsuno and thus this transformation may more properly be called the Itsuno-Corey oxazaborolidine reduction.
In 1981, Itsuno and coworkers first reported the use of chiral alkoxy-amine-borane complexes in reducing achiral ketones to chiral alcohols enantioselectively and in high yield.