反应详情

4-Hydroxy-1,3-dihydro-2-benzofuran-1,3-dione (685 mg, 4 mmol) was dissolved in dry THF (30 mL) at −78° C. K-Selectride 1M solution in THF (13 mL, 13 mmol) was added drop wise in 20 min then the mixture was warmed from −78° C. to −30° C. over 3 hrs. The final mixture was poured into ethyl acetate (100 mL), brine (25 mL) and a 3M hydrochloric acid solution (25 mL). The organic layer was collected, washed with brine and evaporated to dryness. The resulting compound was dissolved in MeOH (20 mL) and treated under stirring with a 3M hydrochloric acid solution (10 mL). The mixture was then diluted with ethyl acetate (100 mL) and brine (25 mL), the organic layer was collected and evaporated under vacuum. The residue was purified by flash chromatography on silica gel using dichloromethane as eluent affording the phenol intermediate (430 mg).

1. temperaturethe mixture was warmed from −78° C. to −30° C. over 3 hrs
2. customThe organic layer was collected
3. washwashed with brine
4. customevaporated to dryness
5. dissolutionThe resulting compound was dissolved in MeOH (20 mL)
6. additiontreated
7. additionThe mixture was then diluted with ethyl acetate (100 mL) and brine (25 mL)
8. customthe organic layer was collected
9. customevaporated under vacuum
10. customThe residue was purified by flash chromatography on silica gel