反应详情

Lead cyanamide (24.7 g.) was added to a solution of N-methyl-N'-[2-(4-imidazolylmethylthio)ethyl]thiourea (11.5 g.) in acetonitrile (250 ml.) containing dimethylformamide. The stirred suspension was heated under reflux for 48 hours. Filtration followed by concentration under reduced pressure and purification of the product or a column of silica gel with ethyl acetate-isopropyl alcohol (2.1) as eluant gave N-cyano-N'-[2-(4-imidazolylmethylthio)ethyl]-N"-methylguanidine (3.7 g.), m.p. 138°-140° (from acetonitrile). (Found: C, 45.7; H, 5.9; N, 35.5; S, 13.5. C9H14N6S requires: C, 45.4; H, 5.9; N, 35.3; S, 13.5).

1. temperatureThe stirred suspension was heated
2. temperatureunder reflux for 48 hours
3. filtrationFiltration
4. concentrationfollowed by concentration under reduced pressure and purification of the product