1-Tert-butyl 2-methyl pyrrolidine-1,2-dicarboxylate → 1-Boc-2-Formylpyrrolidine

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To a solution of pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester (3.5 g) in toluene (40 mL) at −78° C. was added dropwise diisobutylaluminium hydride (20 mL of a 1.5 M solution in toluene) maintaining the temperature below −65° C. The reaction mixture was stirred at −78° C. for 2 hours and then quenched with methanol (10 mL). The mixture was then diluted with diethyl ether (50 mL), potassium sodium tartrate tetrahydrate was added and the mixture stirred vigorously for 20 min at room temperature. The two phases were then separated and the aqueous layer extracted with dichloromethane (2×50 mL). The combined organics were then washed with brine (100 mL), dried (MgSO4), reduced in vacuo and purified by column chromatography to give 2-formyl-pyrrolidine-1-carboxylic acid tert-butyl ester (2.68 g).

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