反应详情

A mixture of 4-benzyl-3-n-butoxy-5-sulfamylbenzoic acid (3.6 g), thionyl chloride (20 ml) and N,N-dimethylformamide (0.1 ml) is refluxed for 1 hour and is then evaporated in vacuo. The resulting crude 4-benzyl-3-n-butoxy-5-sulfamylbenzoyl chloride is dissolved in methylene chloride (30 ml), and the resulting solution is during about 15 minutes added dropwise to a stirred mixture of dimethylamine (10 ml; 40% in water) and methylene chloride (20 ml), keeping the temperature at 0°-5° C. by external cooling. After stirring for an additional 2 hours at 22°-25° C., the mixture is washed with water and the organic layer is separated and dried in the presence of magnesium sulphate. Filtration followed by evaporation in vacuo yields crude 4-benzyl-3-n-butoxy-5-sulfamyl-N,N-dimethylbenzamide. After recrystallization from benzene it is obtained with a melting point of 199°-201° C.

1. temperatureis refluxed for 1 hour
2. customis then evaporated in vacuo
3. dissolutionThe resulting crude 4-benzyl-3-n-butoxy-5-sulfamylbenzoyl chloride is dissolved in methylene chloride (30 ml)
4. additionadded dropwise to a stirred mixture of dimethylamine (10 ml; 40% in water) and methylene chloride (20 ml)
5. customat 0°-5° C.
6. washthe mixture is washed with water
7. customthe organic layer is separated
8. dry with materialdried in the presence of magnesium sulphate
9. filtrationFiltration
10. customfollowed by evaporation in vacuo