Ethanolamine → N-(2-hydroxyethyl)-5-oxo-1-(phenylmethyl)-3-pyrrolidinecarboxamide

Beteiligte Stoffe

Reaktionsschritte

A mixture of 46.7 g (1200 mole) of methyl 5-oxo-1-(phenylmethyl)-3-pyrrolidinecarboxylate (J. Org. Chem., 26, 1519 (1961)], 36.7 g (1600 mole) 2-aminoethanol and 500 ml methanol were refluxed overnight. The reaction was cooled to room temperature and the solvent removed at reduced pressure. The residue was taken up in dichloromethane and extracted 3×100 1N sodium hydroxide. The aqueous layer was taken to pH 5, extracted with 3×150 ml dichloromethane, then taken to pH 8 and again extracted with 3×150 ml dichloromethane. The aqueous layer was concentrated at reduced pressure and the resulting slurry stirred in dichloromethane. The salts were filtered off. The combined organic layers were dried over magnesium sulfate, the solvent removed at reduced pressure to yield 47.9 g of N-(2-hydroxyethyl)-5-oxo-1-(phenylmethyl)-3-pyrrolidinecarboxamide as an oil. This was used in the next step without further purification.

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