Trifluoroacetic acid → Ethyl 3-(cyclohexylamino)-2-fluoro-2-methylpropanoate

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C([N:8]([CH:18]1[CH2:23][CH2:22][CH2:21][CH2:20][CH2:19]1)[CH2:9][C:10]([F:17])([CH3:16])[C:11]([O:13][CH2:14][CH3:15])=[O:12])C1C=CC=CC=1.C(O)(C(F)(F)F)=O>C(O)C.[OH-].[OH-].[Pd+2]>[CH:18]1([NH:8][CH2:9][C:10]([F:17])([CH3:16])[C:11]([O:13][CH2:14][CH3:15])=[O:12])[CH2:19][CH2:20][CH2:21][CH2:22][CH2:23]1

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실험 절차

A solution of ethyl 3-(benzyl(cyclohexyl)amino)-2-fluoro-2-methylpropanoate (1.6 g, 5 mmol) in ethanol (20 mL) was hydrogenated with Pd(OH)2 (20%, 176 mg, 0.25 mmol) in presence of TFA (5 mmol) at atmospheric pressure for 20 h. The reaction mixture was filtered through celite. The filtrate was concentrated and diluted to EtOAc/H2O, aqueous layer was basified to pH=11-12 by 1N NaOH. The organic layer was then dried and concentrated to give the product (1.1 g, 95%) as light yellow liquid. [M+H] calc'd for C12H22FNO2, 232. found 232.