反应详情

Under inert gas, 7.00 g of C-(3-bromophenyl)-N-(2,4-dimethoxybenzyl)methanesulfonamide were initially charged in 120 ml of THF, and then, at a temperature of −78° C., 25.14 ml of a 1.6 N methyllithium solution in diethyl ether were added dropwise and the mixture was stirred at constant temperature for 10 minutes. Subsequently, 7 ml of acetone were added. After stirring for 5 minutes, the reaction solution was admixed with 5 ml of acetic acid and stirred for a further 5 minutes, and 100 ml of ethyl acetate were added to the mixture, which was washed with 1×100 ml and 1×50 ml of a saturated aqueous sodium hydrogencarbonate solution and 2×50 ml of a saturated aqueous sodium chloride solution. The organic phase was dried over MgSO4 and concentrated by rotary evaporation. The residue (8.63 g) was used in the next reaction without further purification.

1. stirringAfter stirring for 5 minutes
2. stirringstirred for a further 5 minutes
3. washwas washed with 1×100 ml and 1×50 ml of a saturated aqueous sodium hydrogencarbonate solution and 2×50 ml of a saturated aqueous sodium chloride solution
4. dry with materialThe organic phase was dried over MgSO4
5. concentrationconcentrated by rotary evaporation
6. customThe residue (8.63 g) was used in the next reaction without further purification