反应详情

To a solution of 2-chlorobenzenesulfonic acid 3-hydroxyphenyl ester (570 mg, 2.0 mmol), as prepared in step d of Example 1, in DMF (8 mL) was added NaH (95%, 53 mg, 2.2 mmol). The reaction mixture was stirred under nitrogen for 10 min. N-(tert-Butoxycarbonyl)-3-piperidinemethanol methanesulfonate (586 mg, 2.0 mmol), as prepared in step b, was added and the reaction mixture was stirred at 40° C. under nitrogen overnight. The reaction mixture was diluted with ethyl acetate (150 mL), 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 hexane:ethyl acetate) to give the title compound as a colorless syrup (510 mg, 54%). 1H-NMR (300 MHz, CDCl3) δ 1.32 (m, 1H), 1.45 (s, 9H), 1.65-1.98 (m, 4H), 2.88 (m, 2H), 3.73 (m, 2H), 3.79 (d, 2H), 6.69 (m, 2H), 7.13 (t, 1H), 7.37 (t, 1H), 7.61 (m, 2H), 7.94 (d, 1H).

1. additionwas added
2. stirringthe reaction mixture was stirred at 40° C. under nitrogen overnight
3. washwashed sequentially with saturated NaHCO3 (2×50 mL) and brine (2×50 mL)
4. dry with materialdried over Na2SO4
5. concentrationconcentrated in vacuo
6. customThe residue was purified by flash column chromatography (2:1 hexane:ethyl acetate)