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0 °C

A mixture of (R)-tert-butyl 3-(hydroxymethyl)pyrrolidine-1-carboxylate (21.5 g, 107 mmol) and triethylamine (30 mL, 214 mmol) in dichloromethane (250 mL) was cooled to 0° C. Methanesulfonyl chloride (12.5 mL, 160.5 mmol) was added dropwise via an addition funnel and the resulting mixture was stirred at 0° C. then gradually warmed to room temperature over 3 h. A 10% aqueous citric acid solution was added and the two layers were separated. The organic layer was washed with 10% aqueous citric acid, sat'd aqueous NaHCO3, and brine. The organic layer was dried over sodium sulfate, filtered and the solvent removed on a rotary evaporator to afford 30 g of (R)-tert-butyl 3-(((methylsulfonyl)oxy)methyl)pyrrolidine-1-carboxylate as an orange oil that was used without further purification. 1H NMR (400 MHz, DMSO-d6) δ 4.17 (m, 2H), 3.33 (m, 2H), 3.20 (m, 1H), 3.18 (s, 3H), 3.00 (m, 1H), 2.55 (m, 1H), 2.01 (m, 1H), 1.53 (m, 1H), 1.40 (s, 9H).

1. temperaturethen gradually warmed to room temperature over 3 h
2. customthe two layers were separated
3. washThe organic layer was washed with 10% aqueous citric acid
4. dry with materialThe organic layer was dried over sodium sulfate
5. filtrationfiltered
6. customthe solvent removed on a rotary evaporator