Potassium Carbonate → ethyl 9-(cyanomethyl)-8,9-dihydro-7H-cyclopenta[c]pyrazolo[1,5-a]pyridine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a solution of 6,7-dihydro-5H-cyclopenta[c]pyridin-7-ylacetonitrile (1.77 g, 11.2 mmol) in acetonitrile (22 mL) was added 1-(aminooxy)-2,4-dinitrobenzene (5.00 g, 25.1 mmol), and the mixture was stirred at 40° C. for 16 hr. The solvent was evaporated under reduced pressure. Half of the residue was dissolved in dimethylformamide (22 mL), ethyl propiolate (681 μL, 6.72 mmol) and potassium carbonate (1.55 g, 11.2 mmol) were added, and the mixture was stirred at room temperature for 3 hr. The reaction solution was diluted with water, and the mixture was extracted with diethyl ether. The extract was dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane=10/90→50/50) to give the title compound (440 mg).

Provenance & Evidence