Cesium carbonate → Methyl 5'-amino-2'-methyl-1,1'-biphenyl-4-carboxylate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Methyl 5′-amino-2′-methyl-1,1′-biphenyl-4-carboxylate 3-Bromo-4-methylaniline (744 mg, 4.0 mmol), (4-methoxycarbonylphenyl)boronic acid (864 mg, 4.8 mmol), tetrakis(triphenylphosphine)palladium (100 mg, 0.087 mmol) and caesium carbonate (2.4 g, 7.37 mmol) were mixed in DME (30 ml) and heated at 90° C. for 20 h. The reaction was absorbed onto silica applied to a silica SPE (10 g) and eluted with ethyl acetate/cyclohexane (0–100% ethyl acetate). The solvent was evaporated from the product fractions under vacuum to give methyl 5′-amino-2′-methyl-1,1′-biphenyl-4-carboxylate (500 mg, 43%). NMR; δH CDCl3 8.07,(2H, d), 7.38,(2H, d), 7.07,(1H, d), 6.67,(1H, dd), 6.60,(1H, d), 3.94,(3H, s), 2.14,(3H, s).

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