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0 °C

Diethyl azodicarboxylate (349 mg, 2.0 mmol) was added to a solution of 2-chlorobenzenesulfonic acid 3-hydroxy-5-methylphenyl ester (600 mg, 2.0 mmol), as prepared in the preceding step, N-tert-butoxylcarbonyl-4-piperidinemethanol (430 mg, 2.0 mmol), as prepared in step (b), and triphenylphosphine (525 mg, 2.0 mmol) in tetrahydrofuran (15 mL) at 0° C. The reaction mixture was stirred at 0° C. for 2 h and at room temperature for 3 h. The reaction mixture was quenched with water (50 mL) and was extracted with ethyl acetate (3×50 mL). The organic phase was washed with saturated NaHCO3 (2×50 mL), brine (2×50 mL) and dried over Na2SO4. The solvent removed in vacuo and the residue was purified by flash column chromatography (2:1 ethyl acetate/hexane) to give the title compound as a colorless syrup (895 mg, 90%). 1H-NMR (300 MHz, CDCl3) δ 1.24 (m, 2 H), 1.47 (s, 9 H), 1.76 (d, 2 H, J=6.6 Hz), 1.89 (m, 1 H), 2.24 (s, 3 H), 2.72 (t, 2 H, J=2.4 Hz), 3.68 (d, 2 H, J=3.2 Hz), 4.13 (m, 2 H), 6.47 (t, 1 H, J=2.2 Hz), 6.52 (d, 1 H, J=0.7 Hz), 6.58 (d, 1 H, J=0.8 Hz), 7.38 (dd, 1 H, J=0.6, 0.8 Hz), 7.61 (m, 2 H), and 7.97 (dd, 1 H, J=0.8, 4.0 Hz).

1. customThe reaction mixture was quenched with water (50 mL)
2. extractionwas extracted with ethyl acetate (3×50 mL)
3. washThe organic phase was washed with saturated NaHCO3 (2×50 mL), brine (2×50 mL)
4. dry with materialdried over Na2SO4
5. customThe solvent removed in vacuo
6. customthe residue was purified by flash column chromatography (2:1 ethyl acetate/hexane)