反应详情

To a solution of 4-(4-chloro-benzyloxy)-2-hydroxybenzaldehyde (1.31 g, 5.0 mmol) and sodium cyanoborohydride (1.0 g, 15.9 mmol, Aldrich) in tetrahydrofuran (30 mL) was added methyl orange as an indicator, giving the solution a yellow color; 1N aqueous HCl solution (7.5 mL) was added slowly, keeping the solution orange. The mixture was then stirred overnight at room temperature. Water was added, and the mixture was extracted with ethyl acetate three times. The combined organic phase was washed with water and brine, dried (MgSO4) and concentrated. The residue was purified by flash chromatography eluting with 0-40% ethyl acetate in hexanes to give 5-(4-chloro-benzyloxy)-2-methyl-phenol. (Yield 0.43 g).

1. customgiving the solution a yellow color
2. extractionthe mixture was extracted with ethyl acetate three times
3. washThe combined organic phase was washed with water and brine
4. dry with materialdried (MgSO4)
5. concentrationconcentrated
6. customThe residue was purified by flash chromatography
7. washeluting with 0-40% ethyl acetate in hexanes