Diisopropylethylamine → (2S,4S)-1-[[N-[4-(2-tetrahydropyranyl)oxycarbonylbicyclo[2,2,2]oct-1-yl]amino]acetyl]-4-fluoropyrrolidine-2-carbonitrile

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Reaction Steps

2-Tetrahydropyranyl 4-aminobicyclo[2,2,2]octane-1-carboxylate (62.9 mg) was suspended in acetonitrile (1 mL). To this suspension, diisopropylethylamine (47 μL) was added. With the solution chilled in an ice bath, (2S,4S)-1-(2-bromoacetyl)-4-fluoropyrrolidine-2-carbonitrile (53.1 mg) in acetonitrile (0.8 mL) was added and the mixture was stirred for 4 hours. Subsequently, the reaction mixture was concentrated, and ethyl acetate and water were added to dissolve the residue. To this solution, an aqueous sodium bicarbonate solution was added to make the solution basic and the solution was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (eluant: dichloromethane: methanol=10:1) to obtain (2S,4S)-1-[[N-[4-(2-tetrahydropyranyl)oxycarbonylbicyclo[2,2,2]oct-1-yl]amino]acetyl]-4-fluoropyrrolidine-2-carbonitrile (73.3 mg).

Provenance & Evidence