4-Toluenesulfonyl chloride → 2-tert-Butyl-4-[(3-chloropropyl)amino]-5-phenylisothiazol-3(2H)-one 1,1-dioxide

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Reaction Steps

A mixture of 2-tert-butyl-4-[(3-hydroxypropyl)amino]-5-phenylisothiazol-3(2H)-one 1,1-dioxide (Example 49) (0.14 g, 0.42 mmol 4-methylbenzenesulfonyl chloride (0.089 mg, 0.46 mmol) and TEA (0.065 ml, 0.46 mmol) in DCM (2 ml) was stirred at rt for 2 h, after which more TEA (0.065 ml, 0.46 mmol) and cat. DMAP were added. After a further 18 h more 4-methylbenzenesulfonyl chloride (0.16 mg, 0.84 mmol), TEA (0.059 ml, 0.42 mmol) and DMAP (0.052 g, 0.42 mmol) were added. After 5 h the reaction mixture was warmed to reflux for 18 h and evaporated to dryness. The residue was purified by silica gel column chromatography (Horizons Biotage) using 10% EtOAc in hexane as eluent to give the title compound (0.097 g, 64%). 1H NMR (500 MHz, CDCl3): δ 7.56-7.50 (m, 2H), 7.50-7.44 (m, 3H), 5.32 (t, 1H), 3.35 (t, 2H), 3.08 (q, 2H), 1.80-1.72 (m, 11H); 13C NMR (125 MHz, CDCl3): δ 159.8, 135.0, 131.8, 130.0, 128.9, 124.9, 107.8, 61.8, 41.7, 41.3, 32.0, 27.8; Mass Spectrum: M+H+ 357.

Provenance & Evidence