反应详情

A solution of 12.68 g. of 1-(2-aminoethyl)-3-(2,6-dichlorophenyl)thiourea in 80 ml. of ethanol, 4.0 ml. of concentrated hydrochloric acid and 12 ml. of iodomethane was refluxed for 2 hours. On cooling, the mixture was poured onto 200 ml. of water and sufficient 4 N sodium hydroxide was added to bring the pH to 11. The aqueous solution was extracted 3×150 ml. of methylene chloride, and the combined organic layers were washed 1×100 ml. of water, dried over potassium carbonate and concentrated. The resulting gum gave a solid on standing, i.e., 1-(2-aminoethyl)-3-(2,6-dichlorophenyl)-2-methylthiopseudourea, m.p. 74°-79°, whose spectral data were consistent with the assigned structure. The material was too labile for purification and was acidified with hydrochloric acid and crystallized from ethanol-ether to give 14.10 g. (84%) of 1-(2-aminoethyl)-3-(2,6-dichlorophenyl)-2-methylthiopseudourea dihydrochloride, m.p. 179°-184°. Two crystallizations from ethanol-ether gave an analytical sample, m.p. 179°-182°.

1. temperatureOn cooling
2. additionthe mixture was poured onto 200 ml
3. extractionThe aqueous solution was extracted 3×150 ml
4. washof methylene chloride, and the combined organic layers were washed 1×100 ml
5. dry with materialof water, dried over potassium carbonate
6. concentrationconcentrated