New Synthetic Routes to β-Polyketone Derivatives : Reactions of 3-Acetyl-2-hydroxy-6-methyl-4H-4-pyranone and 7-Chloro-2, 2-dimethyl-2H, 4H, 5H-pyrano [4, 3-d]-1, 3-dioxin-4, 5-dione with an Enamine (Studies on the β-Carbonyl Compounds connected with the β-Polyketides. III)

抄録

The reaction of 1-morpholino-1-cyclohexene 2 with 3-acetyl-2-hydroxy-6-methyl-4H-4-pyranone 1 gave a condensation product 3, which was subsequently transformed into the 4-pyrone 4, the β-triketone 10 and the phenol 12. The reaction of 2 with 7-chloro-2, 2-dimethyl-2H, 4H, 5H-pyrano [4, 3-d]-1, 3-dioxin-4, 5-dione 13 gave three condensation products, 14, 15 and 16.