反应详情

To a cooled (0° C.) suspension of KH (2.12 g, 1.0 eq) in DMF (30 mL) was added a solution of p-cresol (2.00 g, 18.5 mmol) in 20 mL of DMF. The reaction mixture was stirred 15 minutes, then 18-crown-6 (200 mg) was added followed by a solution of 4.24 g (18.5 mmol) of methyl 2-bromophenylacetate dissolved in 10 mL of DMF. The reaction mixture was stirred 45 minutes, then partitioned between ethyl acetate and water. The organic layer was washed with water, brine, dried (MgSO4), filtered and evaporated in vacuo. The residue was purified on a silica gel flash chromatography column (150×40 mm) eluted with 5% ethyl acetate/hexane to yield 2.63 g (58%) of the title compound.

1. temperatureTo a cooled
2. stirringThe reaction mixture was stirred 45 minutes
3. custompartitioned between ethyl acetate and water
4. washThe organic layer was washed with water, brine
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. customevaporated in vacuo
8. customThe residue was purified on a silica gel flash chromatography column (150×40 mm)
9. washeluted with 5% ethyl acetate/hexane