Water → Tert-butyl (2S)-4-{4-[({4-[(4-chlorophenyl)sulfonyl]cyclohexyl}carbonyl)(methyl)amino]-2-methylbenzyl}-2-methylpiperazine-1-carboxylate

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Reaction Steps

To a solution of tert-butyl (2S)-4-[(4-amino-2-methylphenyl)methyl]-2-methylpiperazine-1-carboxylate (90.6 mg, 0.30 mmol), which is a known compound, and trans-4-[(4-chlorophenyl)sulfonyl]cyclohexanecarboxylic acid (100 mg, 0.30 mmol) synthesized in (10C) in N,N-dimethylformamide (8 mL), 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholium chloride hydrate (106 mg, 0.36 mmol) was added at room temperature, and then, the resulting mixture was stirred at the same temperature for 20 hours. Then, to the reaction solution, water was added, and extraction was performed once with ethyl acetate. The obtained organic layer was washed with water and a saturated aqueous solution of sodium chloride and then dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure, and the obtained residue was purified by silica gel column chromatography (hexane:ethyl acetate=80:20 to 50:50 (v/v)), whereby the title compound was obtained as an oil (80.2 mg, yield: 45%).

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