4-Toluenesulfonyl chloride → N-(4-Bromo-benzyl)-N-(2,2-dimethoxy-ethyl)-4-methyl-benzenesulfonamide

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반응 단계

60.5 g (4-bromo-benzyl)-(2,2-dimethoxy-ethyl)-amine (1, crude product) were dissolved in 270 ml dichloromethane/pyridine (8:1). At 0° C. a solution of 76.0 g (386.4 mmol) p-toluenesulfonylchloride in 100 ml dichloromethane were added and the solution was stirred at room temperature. After 3 h, the reaction mixture was washed twice with 2 N HCl and saturated NaHCO3-solution. The organic layer was dried with MgSO4 and evaporated. Final silicagel chromatography (heptane/ethyl acetate 4:1) gave 59.9 g of the title compound. Rt=1.82 min (Method C). Detected mass: 396.1/398.1 (M-OMe−).

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