Synthesis of New 4-Benzoyl-5-hydroxy-3-Trifluoromethylpyrazole Derivativesvia[1,3] Rearrangements of Benzoyl Group Usingtert- Butyllithium
摘要:
The 4-benzoyl-3-trifluoromethyl-5-p-toluenesulfonyloxypyrazole derivatives (7a - c) were synthesized by a new procedure involving rearrangement of the benzoyl groups in 5-benzoyloxy-4-bromo-3-trifluoromethylpyrazole derivatives (5a - c) to 4-benzoyl-5-hydroxy-3-trifluoromethylpyrazoles (6a - c) via lithium-bromide exchange using tert-butyllithium.
Synthesis of New 4-Benzoyl-5-hydroxy-3-Trifluoromethylpyrazole Derivativesvia[1,3] Rearrangements of Benzoyl Group Usingtert- Butyllithium
摘要:
The 4-benzoyl-3-trifluoromethyl-5-p-toluenesulfonyloxypyrazole derivatives (7a - c) were synthesized by a new procedure involving rearrangement of the benzoyl groups in 5-benzoyloxy-4-bromo-3-trifluoromethylpyrazole derivatives (5a - c) to 4-benzoyl-5-hydroxy-3-trifluoromethylpyrazoles (6a - c) via lithium-bromide exchange using tert-butyllithium.