Triethylamine → (S)-4-benzyl-3-butyryloxazolidin-2-one

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Reaction Steps

To a 3-necked RBF (round bottomed flask) is added dichloromethane (2.4 L), (S)-4-benzyl-2-oxazolidinone (200 g, 1.13 moles) and N,N-Dimethyl-4-pyridinamine, (13.6 g; 111.32 mmoles). The flask is cooled in an ice water bath and triethylamine (472 mL; 3.39 moles) is added dropwise at 0° C. To the resulting solution is then added dropwise butanoyl chloride (152.2 mL; 1.46 moles) over 3 h, while keeping the temperature below 5° C. The reaction is then filtered and the filtrate is washed with 1M HCl (aq.) (500 ml×1) and saturated NaHCO3 (500 ml×1). The organic phase is dried over Na2SO4, filtered, and concentrated to afford the title compound (275 g, MS:[M+H]+=248.1 m/z).

Provenance & Evidence