反应详情

To a solution of 2-(4′-chloro-4-methylbiphenyl-3-yl)-5-[1,3]dioxolan-2-ylmethylcyclohexane-1,3-dione (0.275 g, 0.69 mmol) in tetrahydrofuran (5 ml) is added 6M hydrochloric acid (2 ml), and the reaction mixture is stirred at room temperature for 1.5 hours. Additional 6M hydrochloric acid (1 ml) is added and the solution is heated at 50° C. for an additional 2 hours. After cooling to room temperature the reaction mixture is concentrated and the residue partitioned between distilled water (20 ml) and dichloromethane (20 ml). After extraction of the aqueous phase with dichloromethane (3×10 ml) all organic fractions are combined then passed through a phase separator. The fitrate is concentrated in vacuo to afford [4-(4′-Chloro-4-methylbiphenyl-3-yl)-3,5-dioxocyclohexyl]-acetaldehyde as a white foam.

1. temperaturethe solution is heated at 50° C. for an additional 2 hours
2. temperatureAfter cooling to room temperature the reaction mixture
3. concentrationis concentrated
4. customthe residue partitioned
5. distillationbetween distilled water (20 ml) and dichloromethane (20 ml)
6. extractionAfter extraction of the aqueous phase with dichloromethane (3×10 ml) all organic fractions
7. concentrationThe fitrate is concentrated in vacuo