4-Hydroxy-4-(4-pyrimidin-2-yl-phenyl)-piperidine-1-carboxylic acid tert-butyl ester 81 (138 mg, 0.39 mmol) was dissolved in DMF (2 mL) and cooled to 0° C. MeI (0.1 mL) was added followed by the addition of NaH (26 mg, 60% suspension in mineral oil). After 30 min at 0° C., the reaction was quenched with sat. NH4Cl and extracted with ethyl acetate. The combined organic layers was washed with brine, dried and concentrated in vacuo. The residue was purified with prep TLC plates (developing with 50% ethyl acetate/hexanes) to yield a colorless film (80 mg) as the title compound.
