反应详情

To a solution of 2-chlorobenzenesulfonic acid 3-hydroxyphenyl ester (285 mg, 1.0 mmol), as prepared in step d, in DMF (5 mL) was added NaH (95%, 26 mg, 1.1 mmol). The reaction was stirred under nitrogen for 10 min. N-(tert-Butoxycarbonyl)-4-piperidinemethanol methanesulfonate (293 mg, 1.0 mmol), as prepared in the preceding step, was added and the reaction mixture was stirred at 50° C. under nitrogen for 3 h. The reaction mixture was then partitioned between water (50 mL) and ethyl acetate (150 mL). The organic phase 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 hexane:ethyl acetate) to give the title compound as a colorless syrup (325 mg, 69%). 1H-NMR (300 MHz, CDCl3) δ 1.26 (m, 2H), 1.47 (s, 9H), 1.78 (d, 2H), 1.91 (m, 1H), 2.74 (t, 2H), 3.72 (d, 2H), 4.13 (m, 2H), 6.69 (m, 2H), 6.76 (dd, 1H), 7.16 (m, 1H), 7.37 (t, 1H), 7.62 (m, 2H), 7.95 (dd, 1H).

1. additionwas added
2. stirringthe reaction mixture was stirred at 50° C. under nitrogen for 3 h
3. customThe reaction mixture was then partitioned between water (50 mL) and ethyl acetate (150 mL)
4. washThe organic phase was washed sequentially with saturated NaHCO3 (2×50 mL) and brine (2×50 mL)
5. dry with materialdried over Na2SO4
6. concentrationconcentrated in vacuo
7. customThe residue was purified by flash column chromatography (2:1 hexane:ethyl acetate)