Regioselective Synthesis of Trifluoromethyl Group Substituted Pyrazole Derivatives from 1-Aryl-3,4,4,4-tetrafluoro-2-buten-1-ones
摘要:
Trifluoromethyl group substituted pyrazole derivatives were prepared from hydrazines and 1-aryl-3,4,4,4-tetrafluoro-2-buten-1-ones obtained by the deoxyfluorination of beta-diketones. The reaction proceeded regioselectively and 5-aryl-3-trifluoromethyl-1 -phenyl-1H-pyrazole was obtained from phenylhydrazine. On the other hand, when methylhydrazine was used, 3-aryl-5-trifluoromethyl-1-methyl-1H-pyrazole was selectively formed.
Regioselective Synthesis of Trifluoromethyl Group Substituted Pyrazole Derivatives from 1-Aryl-3,4,4,4-tetrafluoro-2-buten-1-ones
摘要:
Trifluoromethyl group substituted pyrazole derivatives were prepared from hydrazines and 1-aryl-3,4,4,4-tetrafluoro-2-buten-1-ones obtained by the deoxyfluorination of beta-diketones. The reaction proceeded regioselectively and 5-aryl-3-trifluoromethyl-1 -phenyl-1H-pyrazole was obtained from phenylhydrazine. On the other hand, when methylhydrazine was used, 3-aryl-5-trifluoromethyl-1-methyl-1H-pyrazole was selectively formed.