1215212-25-1Relevant academic research and scientific papers
Microwave-mediated pyrazole fluorinations using selectfluor
Sloop, Joseph C.,Jackson, James L.,Schmidt, Robert D.
scheme or table, p. 341 - 345 (2010/08/05)
Microwave-mediated electrophilic fluorinations and a new single-pot condensation en route to ring-fluorinated pyrazoles were examined: chemical equation represented The monofluorination by these methods was successful for a variety of pyrazoles, with yields ranging from 13% to 75%. While electrophilic aromatic fluorination of 3-CF3 pyrazoles proved largely ineffective, development ofa single-pot process overcame this limitation. The microwave-mediated reaction is regioselective; ring fluorination of the heterocycle occurs preferentially over phenyl and alkyl substituents. Alkyl side chain fluorination, when desired, can be modulated by reactant ratios. The single-pot method, which involves acid catalysis by H-TEDA, produces 4-fluoropyrazoles products.
