反应详情

To a solution of 3-chlorobenzo[d]isothiazole-5-sulfonyl chloride (90 mg, 0.33 mmol) in methylene chloride (2 mL), diisopropylethylamine (142 μL, 0.82 mmol) and 4-methoxybenzylamine (85 μL, 0.65 mmol) were added at room temperature. After stirring for 6 h, the reaction mixture was diluted with methylene chloride (20 mL) and washed with 10% HCl aqueous solution and brine. The organic layer was then dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure to give a brown residue. Purification by column chromatography, on silica gel, eluting with 2:8 ethyl acetate:hexanes provided 3-chloro-N-(4-methoxybenzyl)benzo-[d]isothiazole-5-sulfonamide (55 mg). 1H NMR (300 MHz, CDCl3): 8.22 (dd, 1H), 7.82 (dd, 1H), 7.75 (dd, 1H), 7.10 (d, 2H), 6.73 (d, 2H), 5.06 (t, 1H), 4.18 (d, 2H), 3.73 ppm (s, 3H). MW=368 confirmed by LC-MS, tr=13.39 min (Method Y) MH+=369.

1. washwashed with 10% HCl aqueous solution and brine
2. dry with materialThe organic layer was then dried over anhydrous magnesium sulfate
3. filtrationfiltered
4. concentrationconcentrated under reduced pressure
5. customto give a brown residue
6. customPurification by column chromatography
7. washon silica gel, eluting with 2:8 ethyl acetate