Reaktion #2041682

Reaktionsgleichung

water

5-bromo-2-iodopyrimidine

sodium carbonate

2,3-difluoro-4-octyloxyphenylboronic acid

→

phenylpyrimidine

Ausbeute 55.5%

2-(2',3'-Difluoro-4'-octyloxyphenyl)-5-bromopyrimidine

Ausbeute 55.5%

Lösungsmittel

DME

DME

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThe mixture was heated
2. 2
   Temperaturunder reflux overnight
3. 3
   Sonstigethe organic layer was separated
4. 4
   ExtraktionThe aqueous layer was extracted with ethyl acetate (twice) and the combined organic solutions
5. 5
   Waschenwere washed with brine
6. 6
   Trocknendried (MgSO4)
7. 7
   SonstigeThe solvent was removed in vacuo
8. 8
   Sonstigethe residue was purified by flash chromatography (5% to 10% ethyl acetate-light petroleum

Vorschrift

--To a degassed mixture of 5-bromo-2-iodopyrimidine 2 (4.0 g, 14.0 mmol) tetrakis(triphenylphosphine)palladium (323 mg, 0.28 mmol), DME (30 ml), and aqueous 2M sodium carbonate (50 ml) was added 2,3-difluoro-4-octyloxyphenylboronic acid 3 (4.42 g, 15.4 mmol) dropwise in DME (10 ml) under an atmosphere of nitrogen. The mixture was heated under reflux overnight; water was added to the mixture and the organic layer was separated. The aqueous layer was extracted with ethyl acetate (twice) and the combined organic solutions were washed with brine and dried (MgSO4). The solvent was removed in vacuo and the residue was purified by flash chromatography (5% to 10% ethyl acetate-light petroleum; the crude material was preloaded onto silica in dichloromethane) to give the phenylpyrimidine 4 (3.1 g, 55%) (from methanol), m.p. 74.6° C.; νmax /cm-1 (KBr) 2920, 2850, 1625, 1475, 1420, 1310 and 1090; δ0.91(1H, t, Me), 1.2-1.55(10H, m), 1.85 (2H, quint, OCH2CH2), 4.11 (2H, t, OCH2), 6.82 (1H, ddd, 5'-H), 7.83 (1H, ddd, 6'-H) and 8.86 (2H, s, 4- and 6-H); m/z 288 (M+ -C8H16), 286 (M+ -C8H16), 178 and 155.

Quelle