反应详情

p-Toluenesulfonyl chloride (1.08 g, 5.69 mmol) in pyridine (15 mL) was added drop wise over 30 min to a cooled (0° C.) solution of ethyl 3-{4-chloro-3-[(1S)-1,2-dihydroxyethyl]phenyl}propanoate (1.41 g, 5.17 mmol) in pyridine (20 mL) under N2. The solution slowly warmed to rt overnight. After 16 h, 1N HCl and ethyl ether were added. The organic layer was isolated and the aqueous layer washed with ethyl ether (2×). The combined organic fractions were washed with 1N HCl, 10% aqueous Cu2SO4, brine, dried (Na2SO4), and concentrated. The crude product was purified by Biotage chromatography (0%-10% EtOAc/Hexanes) to afford 1.77 g of product as an oil (80%). 1H NMR (400 MHz, chloroform-d) δ ppm 7.81 (d, J=8.08 Hz, 2 H) 7.43 (d, J=2.27 Hz, 1 H) 7.36 (d, J=8.34 Hz, 2 H) 7.22 (d, J=8.08 Hz, 1 H) 7.10 (dd, J=8.21, 1.89 Hz, 1 H) 5.34 (td, J=5.62, 2.91 Hz, 1 H) 4.28 (dd, J=10.61, 2.53 Hz, 1 H) 4.14 (q, J=7.24 Hz, 2 H) 3.98 (dd, J=10.61, 8.34 Hz, 1 H) 2.93 (t, J=7.71 Hz, 2 H) 2.60 (t, J=7.83 Hz, 2 H) 2.47 (s, 3 H) 1.25 (t, J=7.07 Hz, 3 H).

1. customThe organic layer was isolated
2. washthe aqueous layer washed with ethyl ether (2×)
3. washThe combined organic fractions were washed with 1N HCl, 10% aqueous Cu2SO4, brine
4. dry with materialdried (Na2SO4)
5. concentrationconcentrated
6. customThe crude product was purified by Biotage chromatography (0%-10% EtOAc/Hexanes)