Reaktion #478690

Reaktionsgleichung

ethyl 5-bromonicotinate

triethylamine

phenyl acetylene

→

title compound

Ausbeute 100.3%

5-Phenylethynyl-nicotinic acid ethyl ester

Ausbeute 100.3%

Lösungsmittel

ethyl acetate

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturbefore being cooled to room temperature
2. 2
   Filtrationfiltered through a pad of celite, and solvent
3. 3
   Sonstigeevaporated
4. 4
   Sonstigeto provide a dark brown oil
5. 5
   WaschenSilica gel column chromatography (9/1-4/1 hexanes/EtOAc elution)

Vorschrift

To a solution of ethyl 5-bromonicotinate (1.15 g, 5 mmol) in ethyl acetate (20 mL) under an N2 atmosphere, was added triethylamine (1.1 mL, 7.5 mmol, 1.5 eq.), phenyl acetylene (0.766 g, 7.5 mmol, 1.5 eq.), dichloro-bis(triphenylphosphine)-palladium(II) (176 mg, 0.25 mmol, 0.05 eq.), and copper iodide (10 mg, 0.05 mmol, 0.01 eq). The reaction mixture was heated at 50° C. for 20 h before being cooled to room temperature, filtered through a pad of celite, and solvent evaporated to provide a dark brown oil. Silica gel column chromatography (9/1-4/1 hexanes/EtOAc elution) provided the title compound as a pale yellow oil (1.26 g, yield 100%). 1H NMR (300 MHz, CDCl3) δ 9.11 (d, J=1.8 Hz, 1H), 8.87 (d, J=2.1 Hz, 1H), 8.39 (dd, J=1.8, 2.1 Hz, 1H), 7.56-7.53 (m, 2H), 7.40-7.30 (m, 3H), 4.42 (q, J=7.2 Hz, 2H), 1.43 (t, J=7.2 Hz, 3H); ESI-MS m/z 251.9 (M+H)+.

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