The Michael Addition of Sulfur Anions to β,β-Substituted Nα-Formyl-α, β-Dehydroamino Acid Esters

Abstract
The addition of lithium benzylthiolates to Nα,-formyl-α,β-dehydro-α-amino acid esters gave protected Nα-formyl-β-S-benzyl-β,β-dialkylcysteine esters. Hydrolysis and Nα-protection produced β,β-dialkyl-cysteines which can be used for peptide synthesis.
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