Benzyl Bromide → 1-Benzylpiperidine

Temperature

57.5 °C

To a stirred solution of 4-(hydroxymethyl)piperidine 38 (0.01 mol) and DIEA (0.02 mol) in anhydrous acetonitrile (20 ml) was added a solution of benzylbromide 39 (0.012 mol) in anhydrous acetonitrile (5 ml) at room temperature. The resulting mixture was heated at 55-60° C. for 12 hours. The progress of the reaction was monitored by TLC. The reaction mixture was concentrated on rotavapor and the residue was diluted with ethyl acetate (50 ml). The resulting ethyl acetate solution was washed with water, dried over anhydrous sodium sulfate (Na2SO4) and evaporated the solvent. The residue was purified by silica gel column chromatography using a gradient of 0 to 100% ethyl acetate and hexane to get the title piperidine 40 in 98% yield (2.00 g) yield. 1H NMR (400 MHz, CDCl3): δ 1.26-1.33 (2H, m); 1.43-1.52 (1H, m); 1.70 (2H, broad d); 1.96 (2H, broad t); 2.90 (2H, broad d); 3.48 (2H, s); 3.49 (2H, s); 7.30 (5H, m). MS (ESI): m/z=206.20 (M+H+).

1. concentrationThe reaction mixture was concentrated on rotavapor
2. additionthe residue was diluted with ethyl acetate (50 ml)
3. washThe resulting ethyl acetate solution was washed with water
4. dry with materialdried over anhydrous sodium sulfate (Na2SO4)
5. customevaporated the solvent
6. customThe residue was purified by silica gel column chromatography

ORD record

ord-0fae9406a1774acaba3b9673ff6b2fab

Source dataset

uspto-grants-2012_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08247563B2