Reaktion #478609

Reaktionsgleichung

1-Bromo-3-(bromomethyl)-5-fluorobenzene

tert-butyl 4-(hydroxymethyl)-4-phenylpiperidine-1-carboxylate

sodium hydride

→

tert-Butyl 4-((3-bromo-5-fluorobenzyloxy)methyl)-4-phenylpiperidine-1-carboxylate

Lösungsmittel

dimethylformamide

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.WAITat room temperature for 30 min
2. 2
   Extraktionextracted with ethyl acetate (2×)
3. 3
   Waschenwashed with brine (2×)
4. 4
   Trocknendried over sodium sulfate
5. 5
   Einengenconcentrated
6. 6
   SonstigeColumn chromatography on silica gel (20% ethyl acetate/hexanes) gave 1.2 g (84%)

Vorschrift

1-Bromo-3-(bromomethyl)-5-fluorobenzene (0.8 g, 3.0 mmol) and tert-butyl 4-(hydroxymethyl)-4-phenylpiperidine-1-carboxylate (0.72 g, 2.5 mmol) were combined in dimethylformamide (8 mL) and cooled to 0° C. The reaction was treated with sodium hydride (120 mg, 4.98 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 (20% ethyl acetate/hexanes) gave 1.2 g (84%). 1H-NMR (CDCl3, 500 MHz) δ 7.34-7.38 (m, 4H), 7.24-7.25 (m, 1H), 7.08-7.10 (m, 1H), 7.01 (s, 1H), 6.70-6.72 (m, 1H), 4.29 (s, 2H), 3.74-3.77 (m, 2H), 3.38 (s, 2H), 3.00-3.06 (m, 2H), 2.17-2.20 (m, 2H), 1.84-1.90 (m, 2H), 1.44 (s, 9H). Mass spec.: 501.32 (MNa)+.

Quelle