Ethanol → HCID 67499446, compound

Participants

Reaction Conditions

Reaction Steps

To a suspension of phenylboronic acid (0.546 g, 4.47 mmol) in toluene (6.63 ml) was added 3-(3-chloro-4-nitro-1H-pyrazol-1-yl)pyridine (0.335 g, 1.492 mmol) followed by ethanol (3.31 ml) and 2 M aqueous potassium carbonate (1.492 ml, 2.98 mmol). The solution was degassed by applying vacuum and then purging with nitrogen (3 times). To the reaction mixture was added palladium tetrakis (0.086 g, 0.075 mmol) and the flask was heated at 110° C. under nitrogen for 16 hours. The aqueous layer was removed and the organic layer was concentrated. The crude product was purified via silica gel chromatography (0-100% ethyl acetate/hexanes) to give 3-(4-nitro-3-phenyl-1H-pyrazol-1-yl)pyridine (499 mg, 1.874 mmol, 80%) as a yellow solid: mp 144.0-146.0° C.; 1H NMR (400 MHz, CDCl3) δ 9.09 (d, J=2.3 Hz, 1H), 8.82 (s, 1H), 8.71 (dd, J=4.8, 1.4 Hz, 1H), 8.16 (ddd, J=8.3, 2.7, 1.5 Hz, 1H), 7.82-7.74 (m, 2H), 7.55-7.48 (m, 4H); EIMS m/z 266.

Provenance & Evidence