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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 (900 mg, 3.0 mmol), as prepared in step (c) of Example 1, 3-cyanobenzyl alcohol (400 mg, 3.0 mmol; Yoon et al., J. Org. Chem. 38:2786-2792 (1973)), and triphenylphosphine (525 mg, 2.0 mmol) in tetrahydrofuran (20 mL) at 0° C. The 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 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 was removed in vacuo and the residue was purified by flash column chromatography (2:1 ethyl acetate/hexane) to give the title compound as a white solid (1.10 g, 89%). 1H-NMR (300 MHz, CDCl3) δ 2.26 (s, 3 H), 4.99 (s, 2 H), 6.55 (t, 1 H, J=2.3 Hz), 6.60 (t, 1 H, J=0.7 Hz), 6.67 (t, 1 H, J=0.7 Hz), 7.39 (m, 1 H), 7.50 (t, 1 H, J=7.7 Hz), 7.61 (m, 5 H), and 7.96 (d, 1 H, J=1.3 Hz).

1. customThe reaction mixture was quenched with water (50 mL)
2. extractionextracted 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 was removed in vacuo
6. customthe residue was purified by flash column chromatography (2:1 ethyl acetate/hexane)