The reactions of ureas with glyoxylic acid and methyl glyoxylate
作者:Dov Ben-Ishai、Janina Altman、Zmira Bernstein
DOI:10.1016/0040-4020(77)80413-4
日期:——
The reactions of urea, methylurea and dimethylureas with glyoxylicacid and its methyl ester to give α-substituted hydantoic acid derivatives (4, 5, 6, 7) and substituted allantoic acid derivatives (8) is discussed. The cyclization of the hydantoates and allantoates to 5-substituted hydantoins (11, 12) is also described.