A Facile Synthesis of 1,3,5-Trisubstituted Hydantoins via Ugi Four-Component Condensation

A facile access to 1,3,5-trisubstituted hydantoins is achieved by combining an Ugi four-component condensation with a base-induced cyclization. This two-step sequence, which differs from any other method; is experimentally simple and allows a wide variety in the substitution pattern. In this synthesis the acid component, namely trichloroacetic acid, acts as a carbonic acid equivalent.