反应详情

温度

30 °C

Phosgene (23 g, 232 mmol) was passed into ethyl acetate (250 ml) at 10° C. A solution of 2-amino-4,6-dimethoxypyrimidine (20 g, 129 mmol) and tributylamine (47.82 g, 258 mmol) in ethyl acetate (270 ml) was added dropwise in the course of 3 h. 15 min after the addition, the jacket was warmed to 30° C. and ethyl acetate and excess phosgene were distilled off in vac. The remaining solution of the isocyanate was cooled to 10° C. and added dropwise to a suspension of N,N-dimethyl-2-aminosulfonyl-4-nitro-benzamide (31.7 g, 116 mmol) and tributylamine (22.96 g, 232 mmol) in ethyl acetate (100 ml) at 20° C. in the course of 3 h. The mixture was stirred for 1 h and treated with water (300 ml) and potassium hydroxide solution (10% strength, 240 ml). After phase separation, the organic phase was extracted with water (50 ml). The combined aqueous phases were extracted with ethyl acetate (50 ml) and adjusted to pH 2 to 3 using 6M hydrochloric acid. After filtering off the product, washing with water (2×100 ml) and drying, 49.09 g (85.8% of theory) of N,N-dimethyl-2{-N-[N-(4,6-dimethoxypyrimidin-2-yl)aminocarbonyl]aminosulfonyl}-4-nitrobenz-amide were obtained.

1. addition15 min after the addition
2. distillationethyl acetate and excess phosgene were distilled off in vac
3. temperatureThe remaining solution of the isocyanate was cooled to 10° C.
4. customAfter phase separation
5. extractionthe organic phase was extracted with water (50 ml)
6. extractionThe combined aqueous phases were extracted with ethyl acetate (50 ml)
7. filtrationAfter filtering off the product
8. washwashing with water (2×100 ml)
9. customdrying