Reaction Between 5-Isopropylidene-2,2-dimethyl-1,3-dioxane-4,6-dione and tert-Butyl Isocyanide in the Presence of Primary or Secondary Amines

Summary. 5-Isopropylidene-2,2-dimethyl-1,3-dioxane-4,6-dione (the condensation product of Meldrum’s acid and acetone) reacts smoothly with tert-butyl isocyanide in the presence of primary or secondary amines to produce N- tert-butyl-2,2-dimethylbutyramide derivatives and/or 1- tert-butyl-4,4-dimethyl-2,5-dioxopyrrolidine-3-carboxamides in good yields.