A Convenient Synthesis of Versatile Side-chain Intermediates for Carbapenem Antibiotics

Abstract
A useful synthesis of (2S, 4S)-4-(4-methoxybenzylthio)-1-substituted pyrrolidinecarboxylic acid is reported. At each step, practically all compounds were obtained in crystalline form by simple procedure without column chromatography. These compounds are versatile side-chain precursors to carbapenem antibiotics.

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