反应详情

A mixture of N-cyano-N'-{2-[(4-methyl-5-imidazolyl)methylthio]ethyl}-S-methylisothiourea (100 g; 0.371 mole) and distilled propargylamine (150 ml; 2.44 moles) in methanol (500 ml) was stirred at reflux under a positive pressure nitrogen atmosphere (nitrogen sweep) for 22 hours. The reaction mixture was cooled, and the solvent and excess amine were removed by evaporation to leave an amber oil that readily crystallized. The crude product was triturated under isopropanol (250 ml), cooled at 0° for 2 hours and collected by filtration. The filter cake was washed with cold isopropanol and dried in vacuo over P2O5 for 16 hours. The dried title product was a near-white dense solid; yield 73.5 gm (71.7%) m.p. 147°-149°.

1. temperatureat reflux under a positive pressure nitrogen atmosphere (nitrogen sweep) for 22 hours
2. temperatureThe reaction mixture was cooled
3. customthe solvent and excess amine were removed by evaporation
4. customto leave an amber oil
5. customthat readily crystallized
6. customThe crude product was triturated under isopropanol (250 ml)
7. temperaturecooled at 0° for 2 hours
8. filtrationcollected by filtration
9. washThe filter cake was washed with cold isopropanol
10. dry with materialdried in vacuo over P2O5 for 16 hours
11. dry with materialThe dried title product