反应详情

50.2 g of N-methyl-N-(2-nitrophenyl)methanesulfonamide, prepared by the procedure of Example 5, is added to 220 ml of concentrated HCl and contacted with 183.3 g of SnCl2.2H2O. The mixture is heated on a steam bath for one hour. The reaction mixture is treated with enough 5-10% NaOH to raise the pH to 9 while maintaining the temperature of the mixture less than 25° C. The crude reaction mixture is then extracted with CH2Cl2. The CH2Cl2 extracts are dried with MgSO4 and then filtered and concentrated on a rotary evaporator. The solid product obtained (38.1 g), m.p. 138°-139° was used without further purification in the next step.

1. temperatureThe mixture is heated on a steam bath for one hour
2. temperatureto raise the pH to 9
3. temperaturewhile maintaining the temperature of the mixture less than 25° C
4. customThe crude reaction mixture
5. extractionis then extracted with CH2Cl2
6. dry with materialThe CH2Cl2 extracts are dried with MgSO4
7. filtrationfiltered
8. concentrationconcentrated on a rotary evaporator
9. customThe solid product obtained (38.1 g), m.p. 138°-139°
10. customwas used without further purification in the next step