反应详情

1.7 g (15 mmol) of potassium tert-butanolate were added in portions to 4 g (13.6 mmol) of the intermediate 1b in 40 ml of anhydrous dimethylformamide at 0° C., and the mixture was stirred for about 90 minutes. Then 3.4 g (14.3 mmol) of 2,4-dimethoxybenzenesulfonyl chloride were rapidly added dropwise at 0° C. The reaction mixture was stirred at 0° C. for 2 h. This solution was then poured into an ice-water/K2CO3 solution, resulting in a precipitate which was isolated. The resulting residue was treated with a little methanol, filtered off with suction and dried, resulting in 3.3 g of the product.

1. stirringThe reaction mixture was stirred at 0° C. for 2 h
2. customresulting in a precipitate which
3. customwas isolated
4. filtrationfiltered off with suction
5. customdried