反应详情

To a solution of 2-methoxy-3,4,6-trimethylbromobenzene (15.48 g, 67.56 mmol) in tetrahydrofuran (200 ml), which was kept at −78° C., was added dropwise under an argon atmosphere a solution of n-butyllithium in hexane (1.59 mol/l, 42 ml, 66.78 mmol) and the mixture was stirred for 30 minutes. To this mixture was added dropwise a solution of 1-benzyl-4-(4-isopropylbenzoyl)piperidine (19.81 g, 61.63 mmol) in tetrahydrofuran (50 ml) and the resulting mixture was stirred at room temperature for 30 minutes. Water was added to the reaction mixture and the product was extracted with ethyl acetate. The extracts were washed with an aqueous saturated solution of sodium chloride, dried on magnesium sulfate, filtered, and then concentrated under reduced pressure. The residue was crystallized from ethyl acetate-hexane to obtain 23.01 g (79% yield) of the title compound. Melting point: 154-156° C.

1. customwas kept at −78° C.
2. stirringthe resulting mixture was stirred at room temperature for 30 minutes
3. extractionthe product was extracted with ethyl acetate
4. washThe extracts were washed with an aqueous saturated solution of sodium chloride
5. customdried on magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe residue was crystallized from ethyl acetate-hexane