Various alkylated 4-hydroxy-2-pyrones were synthesized from the βδ-diketo-esters (11), (13), and (14), which were easily prepared from the γδ-acetylenic β-keto-esters(3), (4), and (7)via the corresponding enamino-β-keto-esters (8)–(10).
E. Suzuki, H. Sekizaki and S. Inoue, J. Chem. Soc., Chem. Commun., 1973, 568 DOI: 10.1039/C39730000568
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