Cesium carbonate → tert-butyl 4-(1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazol-3-yl)phenethylcarbamate

Participants

Reaction Conditions

Reaction Steps

To a solution of 3-(4-bromophenyl)-1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazole (C52) (0.13 g, 0.32 mmol) in toluene (4 mL) and water (1 mL) was added potassium (2-((tert-butoxycarbonyl)amino)ethyl)trifluoroborate (0.082 g, 0.33 mmol), palladium(II) acetate (0.027 g, 0.027 mmol), cesium carbonate (0.33 g, 1.0 mmol), and dicyclohexyl(2′,6′-diisopropoxy-[1,1′-biphenyl]-2-yl)phosphine (0.016 g, 0.034 mmol), and the solution was stirred under nitrogen and heated to 95° C. for 8 hours. The solution was then cooled and diluted with diethyl ether (5 mL) and adsorbed onto a silica gel pre-column. Flash column chromatography using 0-50% ethyl acetate/hexanes as eluent furnished the title compound as a light tan solid (0.095 g, 63%): mp 149-153° C.; 1H NMR (400 MHz, CDCl3) δ 8.56 (s, 1H), 8.18-8.10 (m, 2H), 7.84-7.77 (m, 2H), 7.43-7.35 (m, 2H), 7.31 (d, J=8.2 Hz, 2H), 4.58 (d, J=8.1 Hz, 1H), 3.49-3.34 (m, 1H), 2.87 (t, J=7.0 Hz, 1H), 1.44 (s, 9H); ESIMS m/z 449 ([M+H]+).

Provenance & Evidence