反应详情

1.15 g. (0.01 mol.) of 1-amino-2,4-dioxoimidazolidine are dissolved in 50 ml. of dioxane while heating. The solution is permitted to cool to room temperature while stirring, wherein a portion of the 1-amino-2,4-dioxoimidazolidine crystallizes out. 2.05 g. (0.01 mol.) of α-isocyanatobenzeneacetic acid, ethyl ester are added and the reation mixture is stirred overnight at room temperature. On the next day the mixture is concentrated and the residue is triturated with ether. 3.0 g. of α-[[[(2,4-dioxo-1-imidazolidinyl)amino]-carbonyl] amino]benzeneacetic acid, ethyl ester are obtained, m.p. 148°-151°.

1. customwherein a portion of the 1-amino-2,4-dioxoimidazolidine crystallizes out
2. stirringthe reation mixture is stirred overnight at room temperature
3. concentrationOn the next day the mixture is concentrated
4. customthe residue is triturated with ether