Sodium hydride → tert-Butyl 4-((3-bromo-5-(trifluoromethyl)benzyloxy)methyl)-4-(4-fluorophenyl)piperidine-1-carboxylate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

1-Bromo-3-(bromomethyl)-5-(trifluoromethyl)benzene (1.2 g, 3.78 mmol) and tert-butyl 4-(4-fluorophenyl)-4-(hydroxymethyl)piperidine-1-carboxylate (0.96 g, 3.2 mmol) were combined in dimethylformamide (10 mL) and cooled to 0° C. The reaction was treated with sodium hydride (151 mg, 6.3 mmol), stirred at 0° C. for 1 h, and at room temperature for 30 min. The reaction mixture was diluted with water and extracted with ethyl acetate (2×). The organic layers were pooled together, washed with brine (2×), dried over sodium sulfate, and concentrated. Column chromatography on silica gel (15% ethyl acetate/hexanes) gave 1.1 g (61%) as a clear oil. 1H-NMR (CDCl3, 500 MHz) δ 7.61 (s, 1H), 7.35 (s, 1H), 7.30-7.31 (m, 2H), 7.26 (s, 1H), 7.03-7.07 (m, 2H), 4.36 (s, 2H), 3.72-3.75 (m, 2H), 3.38 (s, 2H), 3.01-3.06 (m, 2H), 2.13-2.16 (m, 2H), 1.81-1.87 (m, 2H), 1.43 (s, 9H). 13C-NMR (CDCl3, 126 MHz) δ 161.6 (d, J=245.7 Hz), 152.0, 141.9, 138.3, 133.3, 132.4 (q, J=32.6 Hz), 128.8, 127.5 123.2 (q, J=273.5 Hz), 122.8, 122.4, 115.5, 115.3, 79.7, 79.5, 71.7, 68.0, 41.4, 32.2, 28.5, 25.7. Mass spec.: 548.16 (MH)+.

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