Ethyl Acetate → rac-(3R,4R)-1-[(tert-butoxy)carbonyl]-4-(ethoxycarbonyl)pyrrolidine-3-carboxylic acid

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Reaction Steps

A mixture of (3S*,4S*)-1-benzyl-pyrrolidine-3,4-dicarboxylic acid monoethyl ester (10 g, 36.1 mmol), di-tert-butylcarbonate (7.9 g, 39.6 mmol) and Pd(OH)2/C 20% (1 g, 50% wet) in EtOH (200 mL) is stirred under hydrogen atmosphere for 5 h. The crude material is filtered over a pad of Celite and concentrated. 1H-NMR indicates that the title compound is obtained cleanly. TLC, Rf (AcOEt)=0.17. MS (LC-MS): 286.1 [M−H]−.

Provenance & Evidence