Cesium carbonate → 3-Methyl 6-methyl[1,1′-biphenyl]-3,4′-dicarboxylate

Participants

Reaction Steps

A mixture of 3-bromo-4-methyl-benzoic acid methyl ester (3 g), 4-hydroxycarbonyl-phenyl boronic acid (2.21 g), cesium carbonate (4.26 g) and tetrakis(triphenylphosphine)palladium0 (catalytic quantity), in 1:2 aqueous DME (75 ml) was heated to reflux for 18 h. The cooled reaction was then evaporated to dryness and the residue purified on silica gel. Elution with dichloromethane:ethanol:0.880 ammonia; 800:8:1 to 100:8:1 gave a yellow crystalline solid (3.4 g)

Provenance & Evidence