Diisopropylethylamine → Methyl 2-{[6-(2-cyanophenyl)pyridin-3-yl]methyl}-3-oxohexanoate

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Reaction Steps

Process 1: Under argon atmosphere, tetrahydrofuran (20 mL) mixture containing 2-[5-(bromomethyl)pyridin-2-yl]benzonitrile (1.1 g, 3.9 mmol), methyl 3-oxohexanoate (0.68 g, 4.7 mmol), diisopropylethylamine (1.0 g, 7.8 mmol), and lithium bromide monohydrate (0.49 g, 4.7 mmol) was refluxed under heating for 18 hours. The reaction mixture was added water and extracted three times with chloroform. The organic layer was combined, washed with water and brine, dried over anhydrous sodium sulfate, and concentrated in vacuo. The obtained residues were subjected to silica gel column chromatography (SNAP100HP manufactured by Biotage) (hexane/ethyl acetate; 5/1→1/1) to give methyl 2-{[6-(2-cyanophenyl)pyridin-3-yl]methyl}-3-oxohexanoate (1.2 g, 91%) as yellow oil.

Provenance & Evidence