Synthesis of N-acylacetoacetamide using 2,2,6-trimethyl-1,3-dioxin-4-one.

Abstract

Diketene-acetone adduct (2, 2, 6-trimethyl-1, 3-dioxin-4-one) 1 reacts with amide NH to give the corresponding N-acetoacetates 2. Formamide and basic amides such as picolinamide, on treatment with the adduct, are transformed to the N-acyl-2, 6-dimethyl-4-oxo-4H-pyran-3-carboxamide (4a and 4p) together with the corresponding N-acetoacetates.