Hydrochloric Acid → (3S,5S)-1-(tert-butoxycarbonyl)-5-(methoxycarbonyl)pyrrolidine-3-carboxylic acid

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Reaction Steps

To a solution of (2S,4S)-1-tert-butyl 2,4-dimethylpyrrolidine-1,2,4-tricarboxylate (9.56 g, 33.3 mmol) in THF (70 mL) at 0° C. (external temperature, ice bath) was added NaOH (1N aqueous, 33 mL, 33.3 mmol) dropwise over 15 min. The solution was stirred at 0° C. for 5 h before acidification with HCl (1N). The solution was extracted with EtOAc (3×). The combined organic layers were dried over Na2SO4 and concentrated. The crude oil was purified by silica gel chromatography (2% to 5% to 10% MeOH/CH2Cl2) to provide (3S,5S)-1-(tert-butoxycarbonyl)-5-(methoxycarbonyl)pyrrolidine-3-carboxylic acid (6.38 g, 70%).

Provenance & Evidence