Bromoacetonitrile → (R)-tert-butyl 3-((R)-(3-chlorophenyl)(cyanomethoxy)methyl)piperidine-1-carboxylate

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To a solution of (R)-tert-butyl 3-((R)-(3-chlorophenyl)(hydroxy)methyl)piperidine-1-carboxylate (32.5 g, 0.1 mol), NaH (12 g, 0.3 mol) was added at 0° C. The mixture was stirred for 1 h at room temperature. The mixture was cooled to 40° C., then bromoacetonitrile (35.7 g, 0.3 mol) was added drop wise. The mixture was stirred an additional 0.5 h at −20° C. HPLC indicated the reaction was ˜30% complete. The addition of NaH and bromoacetonitrile was repeated two more times. HPLC indicated the reaction was ˜60% completed. The reaction was quenched with sat. NH4Cl. The mixture was extracted with CH2Cl2. The organic layer was dried over Na2SO4, concentrated to give the crude product as brown oil (36.8 g), which was used for the next step without purification.

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