A traceless solid-phase synthesis of 2-imidazolones has been developed. Polymer-bound glycerol resin was reacted with bromoacetaldehyde diethyl acetal to give the cyclic acetal bromide on the solidsupport. Amination of the resin-bound acetal bromide followed by urea formation by reaction with isocyanates afforded the resin-bound urea acetals. The aldehyde urea intermediate, which was released from