Ethyl bromodifluoroacetate → tert-Butyl 4-((2-bromo-2,2-difluoroacetamido)methyl)-4-hydroxypiperidine-1-carboxylate

関与物質

反応手順

To a solution of tert-butyl 4-(aminomethyl)-4-hydroxy-piperidine-1-carboxylate (3.00 g, 13.0 mmol) in N,N-dimethylformamide (30 mL) was added ethyl 2-bromo-2,2-difluoro-acetate (2.65 g, 13.0 mmol) and the reaction mixture stirred for 1 h under nitrogen. The reaction mixture was mixture diluted with ethyl acetate and water (25 mL) and brine (25 mL). The organic layer was dried over Na2SO4, filtered and concentrated to provide tert-butyl 4-[[(2-bromo-2,2-difluoro-acetyl)amino]methyl]-4-hydroxy-piperidine-1-carboxylate (4.98 g, 12.9 mmol, 99%). 1H NMR (400 MHz, DMSO-d6) δ 9.04 (t, J=5.9 Hz, 1H), 4.66 (s, 1H), 3.65 (d, J=12.7 Hz, 2H), 3.16 (d, J=6.1 Hz, 2H), 3.02 (s, 2H), 1.38 (m, 13H).

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