反应详情

To a solution of 2-iodopyrazine (10.0 g, 48.5 mmol) in diethyl ether at −50° C. was added dropwise n-BuLi (2.5 M in hexanes, 25 mL, 60.7 mmol), immediately followed by addition of isovaleraldehyde (8.13 mL, 6.48 g, 75 mmol) over 5 minutes. The mixture was allowed to reach room temperature and was added to a saturated NH4Cl solution. The aqueous phase was extracted with TBME (3×100 mL) and the combined organic extracts were washed with brine, dried over MgSO4 and concentrated in vacuo. The resulting oil was filtered over a plug of silica to afford 3-methyl-1-(pyrazin-2-yl)butan-1-ol as a yellow-brownish oil (5.5 g; 68%).

1. customto reach room temperature
2. extractionThe aqueous phase was extracted with TBME (3×100 mL)
3. washthe combined organic extracts were washed with brine
4. dry with materialdried over MgSO4
5. concentrationconcentrated in vacuo
6. filtrationThe resulting oil was filtered over a plug of silica