Potassium Carbonate → HCID 86692460, compound

Participants

Reaction Conditions

Reaction Steps

To 1,4-dioxaspiro[4.5]decane-8-carbonitrile (13.4 g) described in Reference Example 82 (1) was added a 1 M solution of sodium bis(trimethylsilyl)amide in tetrahydrofuran (100 ml), stirred at 0° C., then a solution of 5-bromo-2-fluoropyridine (12.8 g) in tetrahydrofuran (20 ml) was added thereto, and stirred at room temperature for 1 hour. Tetrahydrofuran (20 ml) was added thereto, additionally stirred for 1 hour, then to the reaction solution was added an aqueous solution of potassium carbonate, extracted with ethyl acetate, washed with saturated brine, dried over anhydrous sodium sulfate, and then the solvent was evaporated in vacuo. To the residue were added water (10 ml) and trifluoroacetic acid (50 ml), and stirred at room temperature for 6 hours. The reaction solution was added to an aqueous solution of potassium carbonate, the mixture was extracted with ethyl acetate, the organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate, and then the solvent was evaporated in vacuo. The residue was purified with silica gel column chromatography (n-hexane/ethyl acetate) to give 1-(5-bromopyridin-2-yl)-4-oxocyclohexanecarbonitrile (13.08 g) as a pale yellow solid. MS (ESI) m/z: 279, 281 (M+H)+.

Provenance & Evidence