Ethyl Acetate → tert-butyl (2S)-2-[(methanesulfonyloxy)methyl]pyrrolidine-1-carboxylate

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Reaction Steps

Methane sulphonyl chloride (0.11 ml, 1.4 mmol) was added to a solution of tert-butyl (2S)-2-(hydroxymethyl)pyrrolidine-1-carboxylate (0.25 g, 1.24 mmol) and 4-(dimethylamino)pyridine (0.167 g, 1.4 mmol) in dichloromethane (5 ml). The mixture was stirred at room temperature for 1 hour and then 4-(dimethylamino)pyridine (0.051 g, 0.42 mmol) and methane sulphonyl chloride (0.033 ml, 0.42 mmol) were added and the mixture stirred at room temperature for a further 1 hour. The mixture was purified directly by silica gel chromatography, eluting with a 3:1 to 1:1 mixture of iso-hexane:ethyl acetate to yield tert-butyl (2S)-2-{[(methylsulphonyl)oxy]methyl}pyrrolidine-1-carboxylate (0.325 g, 94% yield):

Provenance & Evidence