Potassium Carbonate → HCID 57561699, compound

Participants

Reaction Steps

4-chloro-N-methylaniline (0.225 mL, 1.86 mmol) was added to a stirring, room temperature solution of 4-formyl-1H-pyrrole-2-carboxylic acid ethyl ester (0.2585 g, 1.55 mmol) in 5% acetic acid in methanol under N2. After stirring at room temperature for 30 minutes, sodium cyanoborohydride (0.1585 g, 2.52 mmol) was added, and the reaction was stirred at room temperature overnight. About 3 mL of saturated K2CO3 were added, and the reaction was extracted twice with ethyl acetate. The combined organics were washed with saturated NaHCO3 (˜4 mL) and brine (˜4 mL), then the combined organics were dried with Na2SO4, filtered and concentrated en vacuo. The crude product was purified by silica gel chromatography (Combiflash column, 85:15 Hexanes:Ethyl acetate) to obtain 0.3419 g (76%) of 4-{[(4-chlorophenyl)-methylamino]methyl]-1H-pyrrole-2-carboxylic acid ethyl ester (191) as a light tan solid. Note: Starting material 4-formyl-1H-pyrrole-2-carboxylic acid ethyl ester has an HPLC retention time=7.337 min. HPLC: 8.478 min.

Provenance & Evidence