Vy. Sosnovskikh, A SIMPLE SYNTHESIS OF YL-1,1,1-TRIFLUORO(TRICHLORO)HEPTA-3,5-DIEN-2-ONES AND -DIMETHYL-6-TRIFLUOROMETHYL-2,3-DIHYDRO-4-PYRIDONE, Russian chemical bulletin, 46(12), 1997, pp. 2145-2146
Treatment of 6-trifluoro(trichloro)methyl-2,3-dihydro-4-pyrones with a
mmonia gives -amino-1,1,1-trifluoro(trichloro)-6-methylhepta-3, 5-dien
-2-ones. Under similar conditions 1-trifluoro-2-hydroxy-6-methylhepta-
2,5-dien-4-one and -1,1,1-trifluoro-2-hydroxy-6-methylhept-2-en-4-one
cyclize into dimethyl-6-trifluoromethyl-2,3-dihydro-4-pyridone.