反应详情

To a solution of ethanesulphonamide (12.0 g.) in dimethylformamide (75 ml.) at 4°, was added a solution of sodium hydroxide (4.45 g.) in water (6 ml.) and carbon disulphide (3.6 ml.) After stirring for 10 minutes at 5° sodium hydroxide (2.2 g.) in water (3 ml.) and carbon disulphate (1.5 ml) was added and after a further 10 minutes similar quantities of sodium hydroxide and carbon disulphide were again added. After stirring for 10 minutes at 5°, methyl iodide (42.6 g.) was added without external cooling and stirring was continued for 2 hours and the reaction mixture added to water (750 ml.) Extraction with ether and concentration yielded crude N-ethanesulphonyliminodithiocarbonic acid dimethyl ester (6.4 g.) This was reacted directly with 4-methyl-5-((2-aminoethyl)thiomethyl)imidazole (5.0 g.) and methylamine in ethanol by the method described in Example 7. The product was chromatographed on column of silica gel with ethyl acetate-ethanol (2:1) as eluant to yield N-ethanesulphonyl-N'-methyl-N"[2-((4-methyl-5-imidazolyl)methylthio)ethyl]guanidine as a glass (4.0 g.)

1. additionwere again added
2. temperaturewithout external cooling
3. stirringstirring
4. waitwas continued for 2 hours