Diethyl ethylmalonate → 2-(3-Cyano-6-iodo-quinolin-4-yl)-2-ethyl-malonic acid diethyl ester

Participants

Reaction Steps

Potassium hydride (35% oil dispersion, 220 mg, 1.91 mmol) was washed with newly opened hexane for two times under Argon. Then anhydrous tetrahydrofuran (55 mL) was added, followed by addition of 2-ethyl-malonic acid diethyl ester (480 mg, 2.54 mmol). The reaction mixture was stirred at about room temperature for 10 min. Then 4-chloro-6-iodo-quinoline-3-carbonitrile (example 14c, 200 mg, 0.64 mmol) in anhydrous tetrahydrofuran (3 mL) was added to the above reaction mixture, and then reaction continued at room temperature for another 30 min. The reaction was quenched with ice water, and then extracted with ethyl acetate. The organic layers were collected, washed with brain, dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70-230 mesh, 20% ethyl acetate in hexane in 25 min) afforded 2-(3-cyano-6-iodo-quinolin-4-yl)-2-ethyl-malonic acid diethyl ester (250 mg, 85%) as colorless viscous oil. LC-MS m/e 467 (MH+).

Provenance & Evidence