Potassium Phosphate, Tribasic → HCID 68484956, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 4-(4-bromo-4′-chlorobiphenyl-3-yl)-2,2,6,6-tetramethylpyran-3,5-dione (0.390 g, 0.90 mmol), cyclopropylboronic acid (0.100 g, 1.16 mmol), potassium phosphate (0.665 g, 3.14 mmol) and tricyclohexylphosphine (0.025 g, 0.09 mmol) in a mixed solvent system of toluene (4 ml) and distilled water (0.2 ml) is added palladium acetate (0.010 g, 0.044 mmol). This mixture is then heated at 100° C. overnight. After cooling to room temperature the solution is diluted with ethyl acetate and distilled water, then filtered through diatomaceous earth (additional washing with ethyl acetate/distilled water). The aqueous phase is acidified with 2M aqueous hydrochloric acid to pH3, then the organic phase is separated and the aqueous phase extracted again with ethyl acetate (×2). All organic fractions are combined, washed with brine, then dried over anhydrous magnesium sulfate and filtered. After concentration in vacuo the crude oil is purified by preparative reverse phase HPLC then triturated with hexanes to afford 4-(4′-chloro-4-cyclopropylbiphenyl-3-yl)-2,2,6,6-tetramethylpyran-3,5-dione (0.011 g) as a white solid.

Provenance & Evidence