Ethanol → (4R*,5R*)-1-azabicyclo[3.3.1]nonane-4-carbonitrile

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To a solution of 2.00 g of 1-azabicyclo[3.3.1]nonan-4-one in 100 ml of dimethoxyethane, 3.65 g of p-toluenesulfonylmethylisocyanide and 1.13 g of ethanol were added, followed by cooling to 5° C. Then, 4.00 g of potassium tert-butoxide was added while keeping the internal temperature below 10° C. The mixture was stirred at room temperature for 30 minutes, followed by further stirring at 40° C. for 30 minutes. The precipitate thus formed was removed by filtration. The residue obtained by evaporation of the solvent was purified by an alumina column chromatography (eluent: chloroform:hexane=1:1). The resulting crude product was then purified by silica gel column chromatography (eluent: chloroform:methanol=20:1), whereby 1.01 g of (4R*,5R*)-1-azabicyclo[3.3.1]nonane-4-carbonitrile was obtained.

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