Triphenylphosphine → 4-[2-Methyl-5-(4-methylthiazol-2-yl)phenyl]-2,2,6,6-tetramethylpyran-3,5-dione

Participants

Reaction Conditions

Reaction Steps

To a mixture of 4-(5-bromo-2-methylphenyl)-2,2,6,6-tetramethylpyran-3,5-dione (200 mg, 0.589 mmol), 4-methylthiazole (70 mg, 0.707 mmol), silver carbonate (814 mg, 2.94 mmol), triphenylphosphine (15 mg, 0.0589 mmol) and [1,1-bis(diphenylphosphino)-ferrocene]palladium(II)chloride (24 mg, 0.0294 mmol) is added a degassed solvent mixture of water/acetonitrile (1.5 ml, 1:1 ratio), followed by subsequent purging with nitrogen then heating at 65° C. for 65 hours with shaking. After cooling to room temperature the reaction mixture is then partitioned between 2M aqueous hydrochloric acid and dichloromethane, and the organic phase is separated. The aqueous layer is washed with a further aliquot of dichloromethane, and the combined organic layers are evaporated under reduced pressure to give a brown solid which is purified by preparative reverse phase HPLC to give 4-[2-methyl-5-(4-methylthiazol-2-yl)phenyl]-2,2,6,6-tetramethylpyran-3,5-dione as a pale yellow solid (36 mg).

Provenance & Evidence