反应详情

A mixture of 4.18 g (47 mmol) of β-alanine, of 1,88 g (47 mmol) of sodium hydroxide in 20 cm3 of water and of 15 g (47 mmol) of N-(4-cyanophenyl)-S-methylisothiourea hydroiodide in 100 cm3 of 95% ethanol is heated to reflux for 5 hours. The precipitate formed is filtered, then dissolved in 150 cm3 of 1N aqueous sodium hydroxide solution. The solution obtained is washed with ethyl acetate (3×50 cm3), then neutralized to pH 7 by a concentrated HCl solution. The precipitate obtained is filtered, washed with hot absolute ethanol, then recrystallized in water. 7 g (yield 65%) of N-[4-cyanophenylamino(imino)methyl]-3-aminopropanoic acid, having a melting point of 233°-235° C., are obtained.

1. temperatureto reflux for 5 hours
2. customThe precipitate formed
3. filtrationis filtered
4. dissolutiondissolved in 150 cm3 of 1N aqueous sodium hydroxide solution
5. customThe solution obtained
6. washis washed with ethyl acetate (3×50 cm3)
7. customThe precipitate obtained
8. filtrationis filtered
9. washwashed with hot absolute ethanol
10. customrecrystallized in water