反应详情

A stirred solution of 4-bromoanisole (639 mg) in THF (15 ml) under argon was cooled to −78° C. A solution of n-butyllithium (2.07 ml, 1.6 M in hexane) was added slowly while keeping the temperature below −70° C. After stirring for 40 min, a solution of 3-(4-bromo-phenyl)-N-methoxy-N-methyl-3-o-tolyl-propionamide (400 mg, example 74, step 4) in THF (15 ml) was added while keeping the temperature below −70° C. The mixture was stirred at this temperature for 1 hour. The reaction was stopped by addition of saturated aqueous ammonium chloride solution (15 ml). Water was added and the mixture was extracted with ethyl acetate (3×). The combined organic phase was washed with water and brine, dried using MgSO4, filtered and concentrated to dryness. The product was purified by chromatography (SiO2, cyclohexane/ethyl acetate 1:0 to 3:2) to give the title compound (390 mg) as a light yellow oil, MS (ESI+): m/z=409.2 [M+H]+.

1. customthe temperature below −70° C
2. customthe temperature below −70° C
3. stirringThe mixture was stirred at this temperature for 1 hour
4. extractionthe mixture was extracted with ethyl acetate (3×)
5. washThe combined organic phase was washed with water and brine
6. customdried
7. filtrationfiltered
8. concentrationconcentrated to dryness
9. customThe product was purified by chromatography (SiO2, cyclohexane/ethyl acetate 1:0 to 3:2)