Acetic Acid → HCID 15618374, compound

Participants

Reaction Steps

A solution of 53.9 g of ethyl N-(ethoxycarbonylmethyl)-N-(ethoxycarbonyl)-β-alaninate in 200 ml of toluene is added dropwise to a stirred solution of potassium hexamethyldisilazide (429 ml, 0,653 M) in 125 ml of toluene under nitrogen and cooled to 0° . After 45 minutes at 0°, 21.6 ml of acetic acid is added followed by a solution of 100 g of sodium phosphate (monobasic) in 1 liter of water. The layers are separated, the organic layer is washed with pH 7 buffer, dried over sodium sulfate, filtered, concentrated and purified by flash chromatography using ethyl acetate/hexane (3:7) to yield ethyl 1-ethoxycarbonyl-3-oxo-pyrrolidine-2-carboxylate.

Provenance & Evidence