Triethylamine → carbonic acid 4-(2,5-dimethyl-phenyl)-2-(1-methoxy-piperidin-4-ylmethyl)-5-oxo-2,5-dihydro-1H-pyrrol-3-yl ester ethyl ester

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Reaction Steps

Ethyl chloroformate (72 mg, 0.67 mmol) was added dropwise to a solution of 3-(2,5-dimethyl-phenyl)-4-hydroxy-5-(1-methoxy-piperidin-4-ylmethyl)-1,5-dihydro-pyrrol-2-one (220 mg, 0.67 mmol), Et3N (94 mg, 0.9 mmol) and DMAP (30 mg, 0.25 mmol) in 10 ml of THF at room temperature. The mixture was stirred for 30 min and concentrated to dryness in vacuo. The residue was purified by column chromatography on silica gel. Yield: 150 mg of carbonic acid 4-(2,5-dimethyl-phenyl)-2-(1-methoxy-piperidin-4-ylmethyl)-5-oxo-2,5-dihydro-1H-pyrrol-3-yl ester ethyl ester (title compound P1.1) as a gum.

Provenance & Evidence