Preparation of 5-Fluoropyrazoles from Pyrazoles and <i>N</i>-Fluorobenzenesulfonimide (NFSI)
作者:Vitalina Levchenko、Yurii V. Dmytriv、Andriy V. Tymtsunik、Konstantin Liubchak、Alexander Rudnichenko、Anton V. Melnyk、Stanislav Y. Veselovych、Yurii V. Borodulin、Oleksandr M. Otsalyuk、Andrei A. Tolmachev、Pavel K. Mykhailiuk
DOI:10.1021/acs.joc.8b00199
日期:2018.3.16
Facile synthesis of 5-fluoropyrazoles by direct fluorination of pyrazoles with N-fluorobenzenesulfonimide (NFSI) was elaborated. This approach was used to prepare the unsubstituted 5-fluoro-1H-pyrazole, the known fungicide Penflufen, and many functionalized 5-fluoropyrazoles: building blocks for medicinal chemistry and agrochemistry.