反应详情

1-Bromo-4-[(4-iodobenzyloxy)methyl]benzene (3v) was prepared using an non-optimized procedure as follows. To a stirred solution of 4-iodobenzyl alcohol (1.33 g, 5.5 mmol, 1.1 equiv) in DMF (40 mL) at 0° C. was added NaH (240 mg, 60% in mineral oil, 6.0 mmol, 1.2 equiv), and the mixture was warmed to room temperature and stirred for 30 min. The mixture was cooled to 0° C., and 4-bromobenzyl bromide (1.25 g, 5.0 mmol, 1.0 equiv) and tetra-n-butylammonium iodide (92.3 mg, 0.25 mmol, 0.050 equiv) were added. The reaction mixture was warmed to room temperature, stirred for 2 h and quenched with saturated aqueous NH4Cl solution. The mixture was extracted with Et2O, and the organic layer was washed with 1 M aqueous HCl solution and brine and dried over Na2SO4. After evaporation of the solvent, the crude mixture was purified by flash silica gel column chromatography (hexane/Et2O=400/1 to 20/1) to give 1-bromo-4-[(4-iodobenzyloxy)methyl]benzene (3v) as a white solid (1.02 g, 51% yield). 1H NMR (400 MHz, CDCl3): δ 7.68 (d, J=8.4 Hz, 2 H), 7.48 (d, J=8.4 Hz, 2 H), 7.22 (d, J=8.4 Hz, 2 H), 7.10 (d, J=8.4 Hz, 2 H), 4.49 (s, 4 H). 13C{1H} NMR (125 MHz, CDCl3): δ 137.9, 137.8, 137.2, 131.8, 129.8, 129.6, 121.9, 93.4, 71.8, 71.7. Anal. calcd. for C14H12BrIO: C, 41.72; H, 3.00; found: C, 41.71; H, 2.77.

1. custom1-Bromo-4-[(4-iodobenzyloxy)methyl]benzene (3v) was prepared
2. temperatureThe mixture was cooled to 0° C.
3. temperatureThe reaction mixture was warmed to room temperature
4. stirringstirred for 2 h
5. customquenched with saturated aqueous NH4Cl solution
6. extractionThe mixture was extracted with Et2O
7. washthe organic layer was washed with 1 M aqueous HCl solution and brine
8. dry with materialdried over Na2SO4
9. customAfter evaporation of the solvent
10. customthe crude mixture was purified by flash silica gel column chromatography (hexane/Et2O=400/1 to 20/1)