Triphenylphosphine → (R)-5-(Aminomethyl)-1-(4-fluorophenyl)pyrrolidin-2-one

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Reaction Steps

To a dichloromethane (10 mL)-acetonitrile (2.0 mL) solution of (R)-1-(4-fluorophenyl)-5-(hydroxymethyl)pyrrolidin-2-one (500 mg, 2.39 mmol) synthesized in Reference Synthesis Example 215, triphenylphosphine (753 mg, 2.87 mmol), di-tert-butyl iminodicarboxylate (626 mg, 2.87 mmol), and diethyl azodicarboxylate (40% toluene solution) (1.25 g, 2.87 mmol) were added at room temperature and the resultant mixture was stirred for 1 hour and 30 minutes. After completion of the reaction, the reaction solution was concentrated under reduced pressure and 4 M hydrogen chloride/1,4-dioxane solution (7.5 mL) was added to the obtained residue, followed by stirring the resultant mixture for 1 day. After completion of the reaction, water and ethyl acetate were added to the reaction solution and the resultant mixture was washed with ethyl acetate. Thereafter, 1 M sodium hydroxide aqueous solution was added to the water phase and extraction from the resultant mixture with chloroform was performed. The organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure to obtain a crude product of the title compound (120 mg).

Provenance & Evidence