反应详情

温度

3 °C

Under nitrogen 3.19 g (18 mmol) of solid 3,5-dibutyl-1H-1,2,4-triazole from step 3 was added in small portions of 25 mmol of sodium hydride in 45 ml of dimethylformamide (DMF); stirring was continued until hydrogen evolution had ceased. The anion solution was cooled to 3° C. and treated with a solution of the crude 5-bromo-2-bromomethylpyridine from step 2 (17 mmol) in 20 ml of dry DMF. The reaction was allowed to warm to ambient temperature and stir overnight. Methanol (10 ml) was added to destroy any unreacted sodium hydride and the DMF was removed in vacuo. The residue was dissolved in ethyl acetate, washed with water, and dried (MgSO4). Silica gel chromatography (Waters Prep-500A) using ethyl acetate/hexane (40:60) gave 4.16 g (69% from triazole) of 5-bromo-2-[(3,5-dibutyl-1H-1,2,4-triazol-1-yl)methyl]pyridine as a brown oil: NMR (CDCl3) δ0.88 (t, J=7 Hz, 3H), 0.93 (t, J=7 Hz, 3H), 1.23-1.46 (m, 4H), 1.59-1.78 (m, 4H), 2.63-2.74 (m, 4H), 5.30 (s, 2H), 6.92 (d, J=8 Hz, 1H), 7.72 (dd, J=8 and 2 Hz, 1H), 8.61 (d, J=2 Hz, 1H).

1. temperatureto warm to ambient temperature
2. stirringstir overnight
3. customto destroy any unreacted sodium hydride
4. customthe DMF was removed in vacuo
5. dissolutionThe residue was dissolved in ethyl acetate
6. washwashed with water
7. dry with materialdried (MgSO4)