反应详情

8-Chlorotheophylline (8.5 g, 39.6 mmol) was dissolved in 400 ml of DMF and 2-iodobenzyl chloride (10.0 g, 39.6 mmol), potassium carbonate (5.47 g, 39.6 mmol), and potassium iodide (10 mg, 0.06 mmol) were added. The mixture was stirred at room temperature for 7 days. Water (2500 ml) and EtOAc (800 ml) were added and the layers were separated. The aqueous layer was extracted with 2×500 ml of EtOAc, and the combined organic layer was washed with 500 ml of water, 500 ml of brine, dried over sodium sulphate, and filtered. The solvent was evaporated and the crude product was crystallized from diethyl ether and petrol, to give compound (5A) as white crystals. The mother liquor was evaporated and resuspended in diethyl ether and petrol, to give a second crop of compound (5A).

1. customthe layers were separated
2. extractionThe aqueous layer was extracted with 2×500 ml of EtOAc
3. washthe combined organic layer was washed with 500 ml of water, 500 ml of brine
4. dry with materialdried over sodium sulphate
5. filtrationfiltered
6. customThe solvent was evaporated
7. customthe crude product was crystallized from diethyl ether and petrol