反应详情

--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; δ 0.91(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.

1. temperatureThe mixture was heated
2. temperatureunder reflux overnight
3. customthe organic layer was separated
4. extractionThe aqueous layer was extracted with ethyl acetate (twice) and the combined organic solutions
5. washwere washed with brine
6. dry with materialdried (MgSO4)
7. customThe solvent was removed in vacuo
8. customthe residue was purified by flash chromatography (5% to 10% ethyl acetate-light petroleum