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0 °C

The reaction system of a mixture liquid of 7.76 g (20 mmol) of the obtained 5,6-bis(phenylsulfonyl)-bicyclo[2.2.2]octa-2-ene and 50 ml of anhydrous tetrahydrofuran was purged with nitrogen, and 2.425 ml (22 mmol) of ethyl isocyanoacetate was added to the system then cooled to 0° C. After dropping potassium t-butoxide (50 ml/1 M THF solution) over 2 hours, the solution was stirred for 3 hours. After the reaction was finished, dilute hydrochloric acid was added. The reaction mixture was then washed in turn with saturated aqueous sodium bicarbonate solution, distilled water and saturated saline, and dried over anhydrous sodium sulfate. The resulting product was purified using silica gel column chromatography (chloroform) to give ethyl-4,7-dihydro-4,7-ethano-2H-isoindole-1-carboxylate (3.5 g, 1.6 mmol, yield 80%).

1. additionwas added to the system
2. customover 2 hours
3. washThe reaction mixture was then washed in turn with saturated aqueous sodium bicarbonate solution
4. distillationdistilled water and saturated saline
5. dry with materialdried over anhydrous sodium sulfate
6. customThe resulting product was purified