Sodium Carbonate → 2-(3-Carboxyphenyl)-5-methylbenzoic acid

Temperatur

90 °C

To a solution of 2-bromo-5-methylbenzoic acid (5.00 g, 23.3 mmol) in DME (100 mL) were added 3-carboxyphenylboronic acid (3.86 g; 23.3 mmol), a solution of Na2CO3 (9.90 g, 93 mmol) in H2O and tetrakis(triphenylphosphine)palladium. The mixture was stirred at 90° C. for 4 days. The mixture was allowed to cool to room temperature, diluted with EtOAc (50 mL), and washed with a saturated NaHCO3 solution. The aqueous layer was separated, acidified with 10% HCl, and extracted with EtOAc (3×20 mL). The combined extracts were dried over MgSO4 and concentrated. The crude material was purified by column chromatography (9:1 hexanes/EtOAc 1% acetic acid) to afford 4-methyl-[1,1′-biphenyl]-2,3′-dicarboxylic acid (2.20 g, 37%) as a solid: H NMR (DMSO-d6) δ 2.40 (s, 3H), 7.30 (m, 1H), 7.42 (m, 1H), 7.52-7.57 (m, 2H), 7.60 (s, 1H), 7.85 (s, 1H), 7.91-7.92 (m, 1H).

1. temperatureto cool to room temperature
2. washwashed with a saturated NaHCO3 solution
3. customThe aqueous layer was separated
4. extractionextracted with EtOAc (3×20 mL)
5. dry with materialThe combined extracts were dried over MgSO4
6. concentrationconcentrated
7. customThe crude material was purified by column chromatography (9:1 hexanes/EtOAc 1% acetic acid)

ORD-Eintrag

ord-696909c2d2f54fad84647b8228cbd586

Quelldatensatz

uspto-grants-2007_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07220780B2