Pyridine → 3-(2-Oxo-pyrrolidin-1-ylimino)-3-pyridin-2-yl-propionic acid ethyl ester

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Reaction Steps

Place 1-aminopyrrolidin-2-one hydrochloride (Zubek, A. Z. Chem., 1969, 9(2), 58; 155.6 g, 1.14 mol) in a 3 L flask equipped with mechanical stirrer and nitrogen inlet. Add 3-oxo-3-pyridin-2-yl-propionic acid ethyl ester (Preparation 3-A; 200 g, 1.04 mol) and pyridine (400 mL). Stir the reaction mixture at room temperature for 20 h. Dilute the mixture with water (500 mL) and extract with toluene (2×500 mL). Combine the organic layers, dry (sodium sulfate), filter, and concentrate in vacuo to yield 280 g (98%) of the subtitled compound as a dark oil. MS ES+ m/e 276 (M+1).

Provenance & Evidence