Fluorinated pyrazoles have been conveniently synthesized via 1,3-dipolar cycloaddition of ethyl diazoacetate with fluorine-containing acetylenes of the type R(F)C = CR, where R(F) = polyfluoroalkyl and R = CN or CO2CH3.
DING WEIYU; WEI JIA; PU JIAQI, ORG. CHEM.,(1987) N 1, 59-61