Hydrochloric Acid → 2~5~-Methoxy[1~1~,2~1~:2~3~,3~1~-terphenyl]-2~2~-ol

Temperature

80 °C

To a stirred solution of phenylboronic acid (0.0842 g, 0.691 mmol), Ba(OH)2.8H2O (0.396 g, 1.26 mmol), and Pd(OAc)2 (0.0014 g, 0.00628 mmol) in DME:H2O (6:1, 7 mL) at room temperature was added 2,6-dibromo-4-methoxyphenol (0.0885 g, 0.314 mmol)). The mixture was then heated at 80° C. for 18 h. The reaction was 50% complete, and an additional 2.2 eq. of phenylboronic acid and 0.02 eq. Pd(OAc)2 were added and continued heating for another 24 h. At this point, the reaction was acidified to pH 1 with 1 N HCl and diluted with EtOAc (100 mL). The organic layer was washed with H2O (10 mL) and brine (10 mL) and then dried (MgSO4). After concentration, the residue was purified by flash chromatography (1 to 5% EtAOc/petroleum ether gradient) to afford the product (0.029 g, 33%) as a clear oil; 1H NMR (CDCl3) δ 3.83 (s, 3H), 5.04 (s, 1H), 6.86 (s, 2H), 7.37-7.42 (m, 2H), 7.45-7.50 (m, 4H), 7.54-7.68 (m, 4H); IR (film) 3540, 3060, 2930, 2820, 1605, 1580, 1500, 1470, 1425, 1360, 1330, 1210, 1175, 1120, 1060, 1040, 1025, 755, 700, and 500 cm−1; mass spectrum [EI], m/z 276 (M)+; Anal. Calcd. for C19H16O2.0.80H2O: C, 78.49; H, 6.10; N, 0.00, Found: C, 78.19; H, 5.54; N, 0.19.

1. temperaturecontinued heating for another 24 h
2. washThe organic layer was washed with H2O (10 mL) and brine (10 mL)
3. dry with materialdried (MgSO4)
4. concentrationAfter concentration
5. customthe residue was purified by flash chromatography (1 to 5% EtAOc/petroleum ether gradient)

ORD record

ord-4e2bad2524fa4c159810512058031639

Source dataset

uspto-grants-2004_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06765021B2