H. Kikukawa et T. Nishiwaki, 2-PYRIDONES AND PYRANO[2,3-C]PYRAZOL-6(1H)-ONE BEARING A TRIFLUOROMETHYL GROUP, Journal of chemical research. Synopses, (11), 1995, pp. 476-477
A moderate yield synthesis of 4-trifluoromethyl-2-pyridones and a low
yield formation of a 4-trifluoromethylpyrano[2,3-c]-pyrazol-6(1H)-one
from 3-oxo-4,4,4-trifluorobutanenitriles are reported.