Boronenolates bearing menthone-derived chiral ligands are capable of fair to excellent diastereocontrol in their reactions with chiral aldehydes. Thioester-derived (better than ketone derived) enolates are able to control aldol stereochemistry irrespective of the aldehyde preferences. With thioacetate-derived chiralenolates and enantiopure N,N-dibenzyl α-amino aldehydes, either the 3,4-anti or the