Diastereoselective Synthesis of<i>erythro</i>- and<i>threo</i>-2-Hydroxy-2,3-dialkyl-4-alkenoic Acids by the Ester Enolate Claisen Rearrangement of Allyl 2-Hydroxyalkanoates
The ester enolateClaisenrearrangement of (E)- and (Z)-allyl 2-hydroxyalkanoates diastereoselectively gives erythro- and threo-2-hydroxy-2,3-dialkyl-4-alkenoic acids, respectively.