Dichloromethane → HCID 178519325, Verbindung

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A flask containing 4-bromo-5-nitrothiophene-2-carbaldehyde (1.00 g, 4.24 mmol), (1H-pyrazol-5-yl)boronic acid (510 mg, 4.56 mmol), ethyleneglycol dimethyl ether (20 mL), triethylamine (1.80 mL), water (2.00 mL) and bis(diphenylphosphino)ferrocene]dichloropalladium(II) complex with dichloromethane (340 mg, 0.42 mmol) was evacuated and purged with nitrogen twice, then heated at 80° C. under nitrogen for 4 h. The reaction was cooled to room temperature, poured into a saturated solution of ammonium chloride (20 mL), extracted with ethyl acetate (3×10 mL), combined organics washed with a saturated solution of ammonium chloride (30 mL), dried (Na2SO4) and concentrated under reduced pressure. The crude product was purified by flash chromatography, eluting with ethyl acetate in hexanes, to yield 5-nitro-4-(1H-pyrazol-3-yl)thiophene-2-carbaldehyde as a yellow oil (950 mg, 28%). 1H NMR (400 MHZ, DMSO-d6) δ 6.99 (s, 1H), 7.94 (s, 1H), 8.42 (s, 1H), 10.07 (s, 1H).

Herkunft & Nachweise