Asymmetric Mannich-Type Reactions for the Synthesis of Aspartic Acid Derivatives from Chiral N-tert-Butanesulfinylimino Esters

Abstract
Addition of ketene acetals to sulfinimines derived from homochiral N-tert-butanesulfinamide using various Lewis acids furnishes derivatives of aspartic acid in diastereomeric ratios up to 97:3. Following an easy removal of the N-tert-butanesulfinyl chiral auxiliary, optical active beta-amino esters are obtained.

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