The reaction of 1-morpholinocyclohex-1-ene with 3-acetyl-2-hydroxy-6-methylpyran-4-one (dehydroacetic acid) gave a condensation product (I), which was transformed subsequently into the 4-pyrone (V) and the β-triketone (VII).
S. Tobinaga, N. Takeuchi and H. Nakagawa, J. Chem. Soc., Chem. Commun., 1972, 890 DOI: 10.1039/C39720000890
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