The reagents and solvents were used as received from commercial suppliers. Tetrahydrofuran (THF) was distilled from sodium/benzophenone and stored under Ar over 4 Å molecular sieves prior to use. After extraction, organic phases were dried over anhydrous sodium sulphate. Reactions were monitored using analytical thin-layer chromatography (TLC) on silica gel 60 F 254 Al plates. Developed plates were inspected under UV light and, if necessary, visualised with ninhydrin, vanillin/sulphuric acid, Dragendorff's or potassium permanganate stains. Melting points were determined with Büchi 535 Melting Point Appartus (uncorrected). Nuclear magnetic resonance spectra were recorded on a Bruker Avance III 400 MHz spectrometer at 400 MHz for 1 H, 100 MHz for C, and 376 MHz for F nucleus, respectively, using DMSOd 6 or CDCl 3 with TMS as the internal standard, as solvents. Chemical shifts are reported in parts per million (ppm), the central peak of the residual non-deuterated solvent signal was used as the reference, i.e., for CDCl 3 at 7.27 ppm for 1 H and 77.16 ppm for C, and for DMSO-d 6 at 2.50 ppm for 1 H and 39.52 ppm for C. Alternatively, the TMS peak was calibrated to 0 ppm.