5-置換ヒダントイン並びに5-置換ロダニンの簡易合成法

抄録

In the course of a synthesis of 5-substituted hydantoin and rhodanine by the condensation of aromatic aldehydes with hydantoin or rhodanine, the usual practice is to use acetic anhydride and glacial acetic acid as a solvent, adding anhydrous sodium acetate, and heating for 0.5 to several hours. However, fusion of a mixture of aromatic aldehyde and hydantoin or rhodanine, with the addition of a small amount of diethanolamine, results in completion of the reaction in a few minutes and the 5-substituted hydantoin or rhodanine is obtained in a good yield.