反应详情

Lead cyanamide (52.6 g.) was added to a solution of N-methyl-N'-[2-(3-isothiazolylmethylthio)ethyl]thiourea (17.7 g.) in acetonitrile (500 ml.) containing dimethylformamide (50 ml.). The mixture was stirred under reflux for 48 hours, then filtered and concentrated. The product was chromatographed on silica gel with ethyl acetate as eluant and recrystallised from isopropyl acetate-ether to give N-cyano-N'-[2-(3-isothiazolylmethylthio)ethyl]-N"-methylguanidine, in a crystalline form, m.p. 63°-64°. Further recrystallisation from isopropyl acetate afforded the cyanoguanidine in a crystalline form, m.p. 91°-92°. (Found: C, 42.6; H, 5.2; N, 27.4; S, 25.4. C9H13N5S2 requires: C, 42.3; H, 5.1; N, 27.4; S, 25.1).

1. temperatureunder reflux for 48 hours
2. filtrationfiltered
3. concentrationconcentrated
4. customThe product was chromatographed on silica gel with ethyl acetate as eluant
5. customrecrystallised from isopropyl acetate-ether