4,5-Dihydroxyimidazolidin-2-ones in α-ureidoalkylation of N-carboxyalkyl-, N-hydroxyalkyl-, and N-(aminoalkyl)ureas 4.* α-Ureidoalkylation of N-(2-acetylaminoethyl)ureas

α-Ureidoalkylation of N-(2-acetylammoethyl)ureas with various 4,5-dihydroxyimidazoli-din-2-ones was systematically studied. Novel N-(2-acetylaminoethyl)glycolurils were obtained. Their yields were found to decrease both when moving from l,3-H₂-to l,3-Alk₂-4,5-dihydroxy-imidazolidin-2-ones and when increasing the size of the substituent at the second N atom in the starting acetylaminoethylurea. The higher yields were achieved with 4,5-diphenyl-4,5-dihydroxyimidazolidin-2-one as the starting compound. 2-(2-Acetylaminoethyl)-4-methylgly-coluril exhibits nootropic activity.