Triphenylphosphine → 2-Chlorobenzenesulfonic acid 3-[[N-(tert-butoxycarbonyl)piperidin-3-yl]methoxy]-5-methylphenyl ester

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A solution of 2-chlorobenzenesulfonic acid 3-hydroxy-5-methylphenyl ester (600 mg, 2.0 mmol), as prepared in step c of Example 3, N-(tert-butoxycarbonyl)-3-piperidinemethanol (430 mg, 2.0 mmol), as prepared in step a of Example 2, and triphenylphosphine (525 mg, 2.0 mmol) in tetrahydrofuran (15 mL) at 0° C. was treated with diethyl azodicarboxylate (349 mg, 2.0 mmol). The reaction mixture stirred at 0° C. for 2 h and at room temperature for 3 h. Water (50 mL) was added and the reaction mixture was extracted into ethyl acetate (3×50 mL). The organic extract was washed sequentially with saturated NaHCO3 (2×50 mL) and brine (2×50 mL), dried over Na2SO4, and concentrated in vacuo The residue was purified by flash column chromatography (2:1 ethyl acetate:hexane) to give the title compound as a colorless syrup (875 mg, 88%). 1H-NMR (300 MHz, CDCl3) δ 1.28 (m, 1H), 1.45 (s, 9H), 1.64-1.96 (m, 4H), 2.23 (s, 3H), 2.87 (M, 2H), 3.69 (m, 2H), 3.90 (d, 2H), 6.46 (s, 1H), 6.52 (s, 1H), 6.58 (s, 1H), 7.40 (t, 1H), 7.62 (m, 2H), 7.96 (d, 1H).

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