4-Bromophenol → 4'-(Methylsulfonyl)-[1,1'-biphenyl]-4-ol

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

[4-(Methylsulfonyl)phenyl]boronic acid (0.69 g, 3.40 mmol) was added to a solution of 4-bromophenol (0.5 g, 2.83 mmol) in DME (25 mL), followed by addition of 2M Na2CO3 (25 mL) and Pd(PPh3)4 (0.17 g, 0.14 mmol). The reaction mixture was heated at 90° C. for 3 h, then cooled to ambient temperature, and extracted with ether. The combined organic extract was washed with brine, dried over Na2SO4, filtered, and the filtrate was concentrated to give the crude product as an off-white solid. The crude product was purified by chromatography on a silica gel column eluted with 50% EtOAc/hexane to give 0.45 g (64%) of 4′-(methylsulfonyl)-4-biphenylol as a white solid. Alternatively, 4′-(methylsulfonyl)-4-biphenylol was prepared from 4-bromophenyl methyl sulfone (2 g, 8.5 mmol), (4-hydroxyphenyl)boronic acid (1.76 g, 12.75 mmol), 2M Na2CO3 (100 mL) and Pd(PPh3)4 (0.1 g, 0.08 mmol) in DME (100 mL) in a manner similar to the conditions above. 1H NMR (400 MHz, CDCl3): δ 7.97 (d, 2H, J=8.6 Hz), 7.71 (d, 2H, J=8.3 Hz), 7.51 (d, 2H, J=8.6 Hz), 6.94 (d, 2H, J=8.5 Hz), 4.92 (s, 1H), 3.08 (s, 3H); LRMS (ESI), m/z 249 (M+H).

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