反应详情

温度

5 °C

104 ml of 1.6M n-butyllithium solution in hexane are added to 200 ml of tetrahydrofuran, followed by dropwise addition of 25 ml of 3,5-dimethoxytoluene, at a temperature between 0° and 5° C. The reaction medium is stirred at 5° C. for 1 h 30, followed by introduction of excess gaseous CO2 over 30 minutes. The mixture is introduced into 200 ml of aqueous 0.5N HCl solution and the aqueous phase is extracted with ethyl acetate. The residue is concentrated and chromatographied on a silica column (eluent: dichloromethane/methanol - 93/7).

1. extractionthe aqueous phase is extracted with ethyl acetate
2. concentrationThe residue is concentrated