Ruthenium-Catalyzed Tandem C–H Fluoromethylation/Cyclization of <i>N</i>-Alkylhydrazones with CBr<sub>3</sub>F: Access to 4-Fluoropyrazoles
作者:Alexis Prieto、Didier Bouyssi、Nuno Monteiro
DOI:10.1021/acs.joc.7b00085
日期:2017.3.17
4-Fluoropyrazoles are accessible in a single step from readily available aldehyde-derived N-alkylhydrazones through double C-H fluoroalkylation with tribromofluoromethane (CBr3F). RuCl2(PPh3)(3) has been proven to be the most efficient catalyst for this transformation when compared to a range of other Cu-, Pd-, or Fe-based catalyst systems.