Regioselective synthesis of 4-fluoro-1,5-substituted-1,2,3-triazoles from synthetic surrogates of 1-fluoroalkynes

Here, we show that 1-fluoronitroalkenes can serve as synthetic surrogates of 1-fluoroalkynes in [3+2] cycloaddition reactions with organic azides facilitated by a catalytic amount of trifloroacetic acid. This work provides the first regioselective method to access 4-fluoro-1,5-substituted-1,2,3-triazoles.