Ethanol → tert-butyl 4-[(4-cyanopiperidin-1-yl)methyl]tetrahydro-2H-pyran-4-carboxylate

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To a stirred solution of tert-butyl 4-[(4-oxopiperidin-1-yl)methyl]tetrahydro-2H-pyran-4-carboxylate (8.77 g, 0.0295 mol, step 3) in 1,2-dimethoxyethane (250 mL) was added p-toluenesulfonylmethyl isocyanide (11.51 g, 0.0590 mol), EtOH (3.96 mL, 0.0678 mol) and t-BuOK (11.58 g, 0.1032 mol) at 0° C. The resulting mixture was stirred at 50° C. for 16 h. After cooling, the reaction mixture was poured into sat. NaHCO3 aq. (200 mL), and the mixture was extracted with CH2Cl2 (200 mL×3 times). The extracts were dried over Na2SO4 and concentrated. The residue was chromatographed on a column of silica gel eluting with hexane/ethyl acetate (2:1) to give 5.76 g (63%) of the title compound as a yellow syrup.

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