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Under cooling with ice, pyridinesulfonic acid (19.7 g) in dimethyl sulfoxide (84 mL) was added dropwise to 1-benzhydrylazetidin-3-ol (4.79 g) in triethylamine (27.9 mL), and the resultant mixture was stirred at 50° C. for 40 minutes. The reaction mixture was partitioned between ice-water and ethyl acetate. The organic layer was washed with saturated brine, and then dried over magnesium sulfate anhydrate, followed by filtration. The solvent was evaporated under reduced pressure. The residue was purified through silica gel column chromatography (hexane-ethyl acetate), to thereby give the title compound as a solid (2.85 g, 60%).

1. customThe reaction mixture was partitioned between ice-water and ethyl acetate
2. washThe organic layer was washed with saturated brine
3. dry with materialdried over magnesium sulfate anhydrate
4. filtrationfollowed by filtration
5. customThe solvent was evaporated under reduced pressure
6. customThe residue was purified through silica gel column chromatography (hexane-ethyl acetate)