Transformation of 1,5-diphenylpentane-1,3,5-trione. The synthesis of substituted (4H)-pyranones, pyridin-4(1H)ones and 4H-pyrano[3,2-c]pyridin-4-ones

Article abstract of DOI:10.3987/COM-07-11252

1,5-Diphenylpentane-1,3,5-trione (1) was transformed by the reaction either with N,N-dimethylformamide dimethyl acetal (DMFDMA) or N,N-dimethylacetamide dimethyl acetal (DMADMA) into (N,N-dimethylamino)-methylidene derivatives 2a,b as intermediates. They