反应详情

30 g (2.1×10-1 mols) of 2-methanesulfonylaminoethylamine and 18.1 g (2.3×10-1 mols) of carbon bisulfide were dispersed into 10 ml of ethyl acetate. 32.8 g (2.3×10-1 mols) of triethylamine was added dropwise to the dispersion while stirring at room temperature. The admixture was allowed to react for about 4 hours while the internal temperature thereof was maintained at 40° C. 70 ml of ethanol was added to the reaction system. The resulting crystal was filtered off and then washed with 30 ml of ethanol to obtain 54.0 g of triethylammonium N-(2-methanesulfonylaminoethyl)dithiocarbamate as an intermediate product. 54.0 g (1.7×10-1 mols) of the thus-obtained triethylammonium N-(2-methanesulfonylaminoethyl)dithiocarbamate was dispersed into 75 ml of ethanol. The dispersion was stirred while the internal temperature thereof was maintained at 7° to 8° C. under ice cooling. 28.6 g (1.7×10-1 mols) of ethyl bromoacetate was added dropwise to the dispersion. The dispersion was stirred for about 1 hour while the internal temperature was maintained at 20° C. by suppressing heat generation under ice cooling. The dispersion was further stirred for about 1 hour at room temperature. The resulting reaction product was put into 300 ml of water. The aqueous mixture was extracted with 500 ml of ethyl acetate. The mixture was then washed with water. The resulting ethyl acetate layer was dried over anhydrous sodium sulfate. The ethyl acetate solution was filtered, and the filtrate was concentrated to obtain 43.7 g of 3-(2-methanesulfonylaminoethyl)rhodanine (yield: 100%).

1. customto react for about 4 hours while the internal temperature
2. temperaturethereof was maintained at 40° C
3. filtrationThe resulting crystal was filtered off
4. washwashed with 30 ml of ethanol