R. Downham et al., DISPIROKETALS IN SYNTHESIS .6. HIGHLY STEREOSELECTIVE ALKYLATION AF DISPIROKETAL PROTECTED LACTATE AND GLYCOLATE ENOLATES, Tetrahedron letters, 35(5), 1994, pp. 769-772
Protected lactic acid enolates have been alkylated with a range of ele
ctrophiles to give the substituted adducts with moderate to excellent
stereoselectivity. A chiral protected glycolic acid adduct has also be
en doubly alkylated with high stereoselectivity.