1-benzyl-4,4-difluoropiperidine

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In an argon atmosphere, 1-chloroethyl chloroformate (2.62 mL) was added dropwise to the above-obtained N-benzyl-4,4-difluoropiperidine (4.66 g) in methylene chloride (93 mL) at 0° C., and the resultant mixture was stirred at 55° C. for 2 hours, and then cooled in air. The reaction solvent was removed under reduced pressure, and the residue in methanol (93 mL) was refluxed under heat for 4 hours, and then cooled in air. The reaction solvent was removed under reduced pressure, to thereby give the title compound as a solid (3.03 g, 87%). cooled in air The reaction solvent was removed under reduced pressure the residue in methanol (93 mL) was refluxed under heat for 4 hours cooled in air The reaction solvent was removed under reduced pressure