反应详情

In the same manner as in Reference Example 64 and using ethyl 5-ethyl-2-(4-fluorophenyl)-3-oxo-2,3-dihydro-1H-pyrazole-4-carboxylate (3.1 g, 11 mmol) and methyl trifluoromethanesulfonate (3.7 mL) as starting materials, the title compound (1.9 g, 57%) was obtained as a pale-yellow solid.