反应详情

To a solution of 8.0 ml (0.053 mol) of tetramethylethylenediamine (TMEDA) in 350 ml of THF at -70° C. was added 42 ml (0.055 mol) of a 1.3M solution of s-butyl lithium in cyclohexane and the mixture was stirred for fifteen minutes. To the solution was added dropwise with stirring a solution of 10.36 g (0.050 mol) of 2-methoxy-N,N-diethylbenzamide in 150 ml of THF while maintaining the temperature at -60° C. or below. After stirring for 20 minutes sulfur dioxide was bubbled into the reaction mixture, keeping the reaction temperature below -50° C. until the reaction mixture was acid to wet litmus paper. The mixture was stirred at ambient temperature for two hours, diluted with 450 ml of hexane, and the solid material which had separated was collected, dissolved in 200 ml of water and the mixture treated with 65 g of sodium acetate and 21.5 g (0.19 mol) of hydroxylamine-O-sulfonic acid in portions with stirring. The white solid which separated was collected and dried to give 7.04 g (49%) of 2-aminosulfonyl-6-methoxy-N,N-diethylbenzamide, mp 190°-194.5° C.

1. additionTo the solution was added dropwise
2. temperaturewhile maintaining the temperature at -60° C. or below
3. customwas bubbled into the reaction mixture
4. customthe reaction temperature below -50° C.
5. stirringThe mixture was stirred at ambient temperature for two hours
6. additiondiluted with 450 ml of hexane
7. customthe solid material which had separated
8. customwas collected
9. dissolutiondissolved in 200 ml of water
10. stirringwith stirring
11. customThe white solid which separated
12. customwas collected
13. customdried