as reactants in isonitrile-based multicomponentreactions. Ugi reactions of cyclobutanone and Passerinireactions of tetramethylcyclobutane-1,3-dione have been performed in this work. These reactions are significantly enhanced by being conducted in water, a subject of recent interest whose basis is still in question but whose effects are beyond doubt. The Ugi reaction of cyclobutanone has been used in