Dabco → N-(2,4-dimethoxybenzyl)-2,4,5-trifluoro-N-(pyrimidin-4-yl)benzenesulfonamide

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To a solution of the N-(2,4-dimethoxybenzyl)pyrimidin-4-amine (0.76 g, 3.10 mmol) prepared in Example 14a and 1,4-diazabicyclo[2.2.2]octane (0.70 g, 6.20 mmol) in acetonitrile (20 mL), 2,4,5-trifluorobenzenesulfonyl chloride (1.43 g, 6.20 mmol) was added with cooling on ice, and the reaction solution was stirred at room temperature for 1 hour. The reaction solution was filtered, the filtrate was vacuum concentrated, and the residue was purified with silica gel chromatography (hexane/ethyl acetate=67:33) to yield the title compound (0.72 g, 53%) as a colorless solid.

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