Water → HCID 66608173, Verbindung

Beteiligte Stoffe

Reaktionsschritte

A stirred solution of 2-carboxymethyl-4-methyl-1H-pyrrole-3-carboxylic acid ethyl ester (1.27 g, 6 mmol) in N,N-dimethylformamide (3 ml) and dichloromethane (30 ml) was added with 2-pyrrolidine-1-yl-ethamine (0.83 ml, 6.6 mmol), N-ethyl-N′-(dimethylaminopropyl)-carbodiimide hydrochloride (3 g, 12 mmol) and 1-hydroxybenzotriazol (0.9 g, 6 mmol) in the ice/water-bath. Upon completion of the addition, the reaction mixture was stirred at room temperature overnight, then added with cold water (20 ml), extracted with dichloromethane (50 ml×3). The combined organic extracts were washed with saturated sodium bicarbonate solution (50 ml), water (50 ml), brine (50 ml), dried with anhydrous sodium sulfate, filtered and concentrated under reduced pressure to give 4-methyl-2-[(2-pyrrolidin-1-yl-ethylcarbamoyl)-methyl]-1H-pyrrole-3-carboxylic acid ethyl ester (1.898 g, 100%) as a brown oil which was used as such.

Herkunft & Nachweise