Reaktion #70555

Reaktionsgleichung

5-bromo-2-iodopyrimidine

benzene boronic acid

sodium carbonate

→

oil

Ausbeute 110.3%

5-bromo-2-phenylpyrimidine

Ausbeute 110.3%

Lösungsmittel

toluene

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigethe mixture was partitioned between chloroform (250 mL) and brine (200 mL)
2. 2
   SonstigeThe phases were separated
3. 3
   Trocknenthe organic phase was dried over anhydrous magnesium sulfate
4. 4
   Einengenconcentrated under reduced pressure

Vorschrift

A mixture consisting of 5-bromo-2-iodopyrimidine (Bridge Organics, 10.0 g, 35.1 mmol), benzene boronic acid (Alfa Aesar, 4.25 g, 35.1 mmol), tetrakis(triphenylphosphine)palladium (Strem, 0.405 g, 0.351 mmol), toluene (150 mL), and a 2 M aqueous sodium carbonate solution (35 mL) was stirred at 115° C. (degrees Celsius) under a nitrogen atmosphere for 16 hours. After cooling to room temperature, the mixture was partitioned between chloroform (250 mL) and brine (200 mL). The phases were separated and the organic phase was dried over anhydrous magnesium sulfate, and concentrated under reduced pressure to give an orange oil (9.1 g). The crude product was purified by flash silica column chromatography. Elution through a 500-g Analogix® flash silica cartridge with 100% hexanes afforded the title intermediate as a white solid (3.15 g, 38% yield). Rf 0.69 with 9:1 v/v hexanes-ethyl acetate; 1H-NMR (400 MHz; CDCl3) δ 8.83 (s, 2H), 8.44-8.38 (m, 2H), 7.52-7.46 (m, 3H); MS (APCI+) m/z 236.9 (M+1).

Quelle