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Significance: Zakarian and co-workers report the direct enantioselective Michael addition of carboxylic acids to α,β-usaturated esters using chiral lithium amides as traceless auxiliaries. Comment: The chiral reagents can be readily recovered in 99% yield by extraction with aqueous acid. Additionally, this protocol has been applied to the enantioselective total synthesis of the presumed structure of pulveraven B. R1

Addition of Carboxylic Acids Using Chiral Lithium Amides as Auxiliaries