Synthesis of fluorovinyl pyrazolyl (thio)ethers by the reaction of gem-difluoroalkenes with pyrazolin-5-ones (thiones)

• An efficient method for the synthesis of fluorovinyl pyrazolyl (thio)ethers is reported.
• The reaction of gem-difluoroalkenes with pyrazolin-5-ones (thiones) proceeds efficiently under mild conditions.
• The addition of potassium tert-butoxide is essential for efficient conversion.

A mild and efficient method for the preparation of fluorovinyl pyrazolyl ethers and thioethers by the reaction of gem-difluoroalkenes having aryl substituents with pyrazolin-5-ones and pyrazolin-5-thiones, respectively, in the presence of t-BuOK is described.

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