Potassium Phosphate, Tribasic → HCID 86663669, compound

Participants

Reaction Steps

To a mixture of trifluoromethanesulfonic acid 4′-chloro-2′-fluoro-3-formylbiphenyl-4-yl ester (30.0 g, 0.078 mol), cyclopropyl boronic acid (8.80 g, 0.10 mol), potassium phosphate (58.40 g, 0.28 mol) and sodium bromide (8.0 g, 0.078 mol) is added toluene (300 ml) then distilled water (30 ml) under a nitrogen atmosphere. To this mixture is then added tetrakis(triphenylphosphine) palladium (9.60 g, 8.40 mmol) in one portion, and the mixture is then heated at 100° C. overnight. After cooling to room temperature the mixture is diluted with distilled water (500 ml) and ethyl acetate (500 ml), and the two layers are separated and the aqueous phase extracted again with ethyl acetate (2×500 ml). Organic fractions are combined, washed with distilled water (1 L) then brine (1 L), and then dried over magnesium sulphate. The suspension is filtered and the filtrate concentrated in vacuo. The crude product is purified by flash column chromatography on silica gel, then additionally by flash column chromatography on basic alumina (10% ethyl acetate in hexane as eluant) to afford 4′-chloro-4-cyclopropyl-2′-fluoro-biphenyl-3-carbaldehyde (7.6 g, 36%).

Provenance & Evidence