Diastereoselective Aldol Reactions with Butane-2,3-diacetal Protected Glyceraldehyde Derivatives.

Diastereoselective aldol coupling reactions with butane-2,3-diacetal (BDA) protected glyceraldehyde derivatives are reported. Good selectivities of up to 20 : 1 for the homologated aldol products have been achieved in preparatively useful yields.