Methanesulfonyl chloride → 1-tert-Butyl 2-methyl (2S,4R)-4-((methanesulfonyl)oxy)pyrrolidine-1,2-dicarboxylate

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Reaction Steps

(2S,4R)-4-Hydroxypyrrolidine-1,2-dicarboxylic acid 1-t-butyl ester 2-methyl ester (10.0 g, 41 mmol) was dissolved in DCM (100 mL) and cooled in an ice bath. DIPEA (1.2 equiv) was added, followed by methanesulfonyl chloride (1.2 equiv). The mixture was stirred at room temperature for 48 hours, then diluted with DCM (100 mL). The solution was washed with 1M HCl (100 mL), saturated aqueous NaHCO3 (100 mL) and saturated aqueous NaCl (100 mL), then dried over Na2SO4. The solvent was evaporated to afford the title compound (11.9 g, 37 mmol), which was used without further purification. MS m/z: [M+H]+ calcd for C12H21NO7S, 323.4. found 324.3.

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