Pyridine → (2S)-2-(4-chloro-benzenesulfonylamino)-5,5,5-trifluoro-3-(2,2,2-trifluoroethyl)pentanoic acid methyl ester

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反応条件

反応手順

A solution of 4-chlorobenzenesulfonyl chloride (2.66 g, 12.2 mmol, 97% pure) in CH2Cl2 (7 mL) was added to a solution of (2S)-2-amino-5,5,5-trifluoro-3-(2,2,2-trifluoroethyl)pentanoic acid methyl ester (2.173 g, 8.14 mmol) and pyridine (1.97 mL, 24.4 mmol) in CH2Cl2 (15 mL). The reaction mixture was stirred at 25° C. for 4 hours, then cooled to 0° C. IN HCl (15 mL) was added followed by dichloromethane (10 mL) and the phases were separated. The organic phase was washed with 1N HCl (15 mL) and brine, dried over Na2SO4, and concentrated to afford 4.1 g of crude mixture as a yellow solid. The solids were recrystallized from heptane (14 mL) to afford 3.035 g of the title product (84% yield). Mass Spectrum (+ESI): 442 [M+H]+

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