The SAMP-hydrazone of 2,2-dimethyl-1,3-dioxan-5-one represents
a valuable chiral dihydroxyacetone equivalent. Asymmetric mono-
or α,α′-bisalkylations followed by auxiliary
cleavage leads to the corresponding mono- or α,α′-disubstituted,
acetonide protected ketodiols in excellent diastereo- and enantiomeric
excesses.
asymmetric synthesis - ketodiols - alkylations - hydrazones - chiral dihydroxyacetone
equivalent