反应详情

To a solution containing 0.62 g of the sulfonamide prepared in Example 3 contained in 10 ml of p-dioxane was added 0.6 g of phenyl(4.6-dimethoxy pyrimidin-2-yl)carbamate followed by dropwise addition of 0.33 g of 1,5-diazbicyclo[5.4.0]undec-5-ene (DBU). The solution was stirred at room temperature for two hours then diluted with about 100 ml of water. The clear solution was acidified with concentrated hydrochloric acid (red to litmus paper), to give a viscous oil. The oil was triturated by decanting off the aqueous solvent and stirring the oil residue in about 5 ml of acetonitrile. After filtering the suspension, the solid residue was washed with 1×5 ml of warm ethyl acetate to give 0.26 g of the subject compound; m.p. 174°-177° C.

1. customto give a viscous oil
2. customThe oil was triturated
3. customby decanting off the aqueous solvent
4. stirringstirring the oil residue in about 5 ml of acetonitrile
5. filtrationAfter filtering the suspension
6. washthe solid residue was washed with 1×5 ml of warm ethyl acetate