反应详情

温度

5 °C

The product from Step 1 (2.5 g) was dissolved in methanol (25 cm3) and cooled to 5° C. with stirring under an atmosphere of nitrogen. Sodium methoxide in methanol (2 cm3 of 25% wt./vol. solution) was added dropwise and the mixture allowed to warm to the ambient temperature for 18 hours. The reaction was heated under reflux for 1 hour, cooled, diluted with water (250 cm3), extracted with diethyl ether (2×100 cm3), dried (MgSO4) and evaporated under reduced pressure to give N,N-diethyl 2-amino-4-methylthiazole-5-sulfonamide (0.48 g). M+ 249; 1H NMR: δ 1.20(6H,t); 2.48(3H,s); 3.28(4H,q); 5.25(2H,br s); (solid).

1. temperatureto warm to the ambient temperature for 18 hours
2. temperatureThe reaction was heated
3. temperatureunder reflux for 1 hour
4. temperaturecooled
5. extractionextracted with diethyl ether (2×100 cm3)
6. dry with materialdried (MgSO4)
7. customevaporated under reduced pressure