3-Acetyl-4-hydroxy-6-methyl-2H-pyran-2-one 1a condensed with N,N-dimethylfo
rmamide dimethyl acetal yielding the enaminone 3a. The tatter reacted with
a variety of reagents affording pyridine derivatives 11, benzofuranoylpyran
es 14 and 17, pyranylpyranes 22, pyranylpyrazole 29a,b and pyranylisoxazole
33.