Water → HCID 67499538, compound

Participants

Reaction Conditions

Reaction Steps

tert-Butyl (4-bromo-1H-imidazol-1-yl)(ethyl)carbamate (253.7 mg, 0.874 mmol), pyridin-3-ylboronic acid (113 mg, 0.918 mmol), potassium carbonate (329 mg, 2.39 mmol), water (0.870 mL), absolute ethanol (1.74 mL), and toluene (3.50 mL) were placed into a 10 mL round bottomed flask equipped with condenser and magnetic stirrer. The atmosphere was flushed with nitrogen and tetrakis triphenylphosphine palladium (30.0 mg, 0.026 mmol) was added. The mixture was heated to 110° C. and stirred for 16 hours. The reaction was cooled, the organic layer set aside, and the aqueous layer was extracted with ethyl acetate. All organics were combined, dried over sodium sulfate, and concentrated. The residue was purified using silica gel chromatography (0-25% methanol/dichloromethane) to afford the title compound (81 mg, 0.28 mmol, 32%) as a yellow oil: 1H NMR (400 MHz, CD3CN) δ 9.00 (d, J=2.5 Hz, 1H), 8.46 (d, J=4.8 Hz, 1H), 8.11 (m, 1H), 7.67 (d, J=1.3 Hz, 1H), 7.61 (d, J=1.2 Hz, 1H), 7.36 (m, 1H), 3.76 (q, J=7.1 Hz, 2H), 1.45 (s, 9H), 1.17 (t, J=7.2 Hz, 3H); ESIMS m/z 289 ([M+H]+).

Provenance & Evidence