Ethyl isocyanate → 1-Ethyl-3-(3-fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)urea

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 3-fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline (1.5 g, 6.33 mmol) in DCM (30 ml) was added ethyl isocyanate (1503 μL, 19 mmol). Reaction mixture was stirred at 35° C. for 20 hours. Additional isocyanate was added and reaction mixture left for sufficient time to ensure reaction completion. The crude reaction mixture was then partitioned between water and DCM. The organic layer was recovered, passed through a hydrophobic frit and the solvent removed in vacuo. The residue was purified by flash chromatography using 0-60% ethyl acetate/petroleum ether 40-60 to yield a yellow solid (1.054 g, 3.42 mmol, 54%).

Provenance & Evidence