Potassium Phosphate, Tribasic → Ethyl 2-[1-[2-butoxy-3'-(1-methyl-3-pentylureido)biphenyl-4-yl]meth-(e)-ylidene]butyrate

Participants

Reaction Conditions

Reaction Steps

3 mg (0.013 mmol) of palladium acetate and then 9 mg (0.026 mmol) of 2-(dicyclohexylphosphino)biphenyl are added to a mixture of 523 mg (1.3 mmol) of ethyl 2-[1-(3-butoxy-4-iodophenyl)meth-(E)-ylidene]butyrate (prepared according to Example 22a), 446 mg (1.7 mmol) of 3-(1-methyl-3-pentylureido)phenylboronic acid (prepared according to Example 24h) and 1.3 mL of aqueous 2 M potassium phosphate solution in 6.5 mL of dimethylformamide. The reaction mixture is heated at 90-95° C. for 2 hours. The reaction medium is hydrolyzed in saturated aqueous ammonium chloride solution and extracted with ethyl acetate. The organic phases are combined, washed with saturated sodium chloride solution and dried over magnesium sulfate. After filtration, the solvent is evaporated off and the brown oil obtained (1.2 g) is purified by chromatography on a column of silica eluted with a 70/30 heptane/ethyl acetate mixture. 489 mg (76%) of ethyl 2-[1-[2-butoxy-3′-(1-methyl-3-pentylureido)biphenyl-4-yl]meth-(E)-ylidene]butyrate are obtained.

Provenance & Evidence