Sodium Bicarbonate → 2-[1-[2-[4-(p-Toluidino)piperidin-1-yl]ethyl]cyclooctyl]ethanol

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Reaction Steps

To a suspension of 4-(p-toluidino)piperidine ditrifluoroacetate (synthesized in Preparation Example 4-5) (1.31 g) in 1,2-dichloroethane (6 mL) was added triethylamine (0.96 mL). The suspension was stirred at room temperature for 5 minutes. Then, a solution of 3-oxaspiro[5.7]tridecan-2-ol (synthesized in Example 72) (0.62 g) in 1,2-dichloroethane (3 mL) was added to the suspension, and it was stirred at room temperature for additional 10 minutes. The reaction solution was ice-cooled and sodium triacetoxyborohydride (0.70 g) was added thereto. The reaction solution was then allowed for its temperature to rise to room temperature, and the solution was stirred for additional 4.5 hours. Saturated aqueous sodium bicarbonate solution was added to the reaction solution and it was extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure. The resulting residue was purified by chromatography [silica gel, methanol-chloroform (3:97 to 1:9)] to give the title compound (0.53 g).

Provenance & Evidence