Potassium Carbonate → methyl-(1R)-trans-3-[(1Z,3E)-2-cyano-1,3-pentadienyl]-2,2-dimethylcyclopropane carboxylate

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Methyl-(1R)-trans-3-formyl-2,2-dimethylcyclopropane carboxylate (2.53 g, 16.2 mmol), 3-pentenonitrile (1.90 g, 23.5 mmol) and anhydrous potassium carbonate (3.22 g, 23.3 mmol) were added to 30 mL of N,N-dimethylformamide and the mixture was stirred at room temperature for 24 hours. The reaction solution was added to 100 mL of ice water and the solution was extracted twice with each 100 mL of ethyl acetate. The obtained ethyl acetate layers were combined, washed once with 50 mL of saturated brine and then dried over magnesium sulfate. After concentration under reduced pressure condition, the residue was subjected to silica gel column chromatography to obtain 0.94 g of methyl-(1R)-trans-3-[(1Z,3E)-2-cyano-1,3-pentadienyl]-2,2-dimethylcyclopropane carboxylate represented by the following formula:

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