Dimethyl Sulfoxide → 3-Oxo-azetidine-1-carboxylic acid tert-butyl ester

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Reaction Steps

To a mixture of tert-butyl 3-hydroxyazetidine-1-carboxylate (10.0 g, 57.7 mmol), dimethyl sulfoxide (24.0 mL, 338 mmol), triethylamine (40 mL, 300 mmol) and methylene chloride (2.0 mL) was added sulfur trioxide-pyridine complex (40 g, 200 mmol) portionwise at 0° C. The mixture was stirred for 3 hours, quenched with brine, and extracted with methylene chloride. The combined extracts were dried over anhydrous Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified by silica gel column (0-6% ethyl acetate (EtOAc) in hexanes) to give tert-butyl 3-oxoazetidine-1-carboxylate (5.1 g, 52% yield).

Provenance & Evidence