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With copper(l) iodide; potassium carbonate; (1S,2S)-N,N'-dimethyl-1,2-diaminocyclohexane; In toluene; at 110℃; for 2h;
To a solution of 1-fluoro-4-iodo-benzene (1.47 g, 6.6 mmol, 1.3 eq) and <strong>[5932-27-4]ethyl 1H-pyrazole-3-carboxylate</strong> (0.71 g, 5.1 mmol, 1 eq) in 15 mL of toluene was added CuI (0.19 g, 1.0 mmol, 0.2 eq), trans-N,-N-dimethylcyclohexane 1,2-diamine (0.4 mL, 2.5 mmol, 0.2 eq), and potassium carbonate (1.4 g, 10 mmol, 2 eq). The reaction mixture was heated at 110° C. for 2 d then filtered and concentrated. The residue was purified by silica gel column chromatography (hex:EtoAc 4:1) to afford ethyl 1-(4-fluorophenyl)pyrazole-3-carboxylate (0.92 g, 3.9 mmol, 77percent).
2-(4'-fluorobiphenyl-2-yl)-1-methyl-1H-benzoimidazole[ No CAS ]
Yield
Reaction Conditions
Operation in experiment
77%
With [ruthenium(II)(eta6-1-methyl-4-isopropyl-benzene)(chloride)(mu-chloride)]2; potassium carbonate; triphenylphosphine; In benzene; at 150℃; for 24h;Sealed tube;
General procedure: In a 30-mL sealed tube, <strong>[2622-63-1]1-methyl-2-phenylbenzimidazole</strong> (1, 0.25mmol), [RuCl2(p-cymene)]2 (0.0125 mmol), Ph3P (0.075 mmol),K2CO3 (0.50 mmol), and iodoarene (0.25 mmol) were combined inanhydrous benzene (2 mL) under air. The mixture was then stirredat 150 °C for 24 h. The mixture was cooled to r.t., diluted with EtOAc, and filtered through a small pad of Celite. The filtrate was concentrated in vacuo and purified by flash chromatography (silicagel, EtOAc?hexane) to give the analytically pure 2-(biphenyl-2-yl)benzimidazoles.
With bis(eta3-allyl-mu-chloropalladium(II)); silver trifluoromethanesulfonate; In 1,2-dichloro-ethane; at 80℃; under 3040.2 Torr; for 24h;Inert atmosphere; Sealed tube; Glovebox; Schlenk technique; Green chemistry;
General procedure: Under an inert nitrogen atmosphere, silver triflate (386 mg,1.5 mmol) was transferred to a Teflon sealed thick-walled 50 ml glass reaction vessel equipped with a stir bar, followed by aryl iodide (1.0 mmol), arene (2.0 mmol), DCE (4 ml) and then a freshly prepared stock solution of [Pd(allyl)Cl]2 (0.2 mg, 5 × 10?4 mmol). The vessel was closed, removed from the glovebox, evacuated and backfilled with carbon monoxide three times, and finally pressurized with 4 atm carbon monoxide. After heating at 100 °C for 24 h with stirring, the reaction was cooled to room temperature and carbon monoxide was released. The reaction mixture was filtered through Celite, eluting with dichloromethane. Saturated NaHCO3 was added and the aqueous layer was extracted with dichloromethane. The combined organic layers were concentrated in vacuo and the residue was purified by column chromatography (silica gel, gradient hexane/ethyl acetate 0 to 20percent) to afford the pure ketone product.
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