反应详情

To a solution of 50 (0.05 g, 0.17 mmol) in dichloromethane (1 ml) at room temperature was added polymer supported Hünig's base ((Argonaut, 3.56 mmol/g, 0.089 g, 0.32 mmol, 1.9 eq) and methanesulphonyl chloride (0.02 g, 0.19 mmol). The mixture was stirred under nitrogen for 6 hours then filtered and concentrated in vacuo. The crude product was purified by flash column chromatography (eluent: ethyl acetate/heptane 33/67 (v/v)) to give 51 as a colourless oil (0.035 g, 55%%); MW 375.49; C20H25NO4S 1H NMR (CDCl3) 7.20-7.35 (10H, m), 5.46 (1H, d), 3.79-3.88 (2H, m), 3.59 (1H,td), 3.4 (1H, q), 2.68-2.78 (2H, m), 2.68 (3H, s), 2.03-2.24 (2H, m), 1.34 (3H, d). m/z [M+H]+ 376.

1. filtrationthen filtered
2. concentrationconcentrated in vacuo
3. customThe crude product was purified by flash column chromatography (eluent: ethyl acetate/heptane 33/67 (v/v))