Toluene → Methyl 3-benzoylcinnamate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a mixture of 3-bromobenzophenone (5.0 g, 19 mmol), palladium acetate (215 mg, 0.958 mmol), and tri-o-tolylphosphine (290 mg, 0.953 mmol) was added triethylamine (3.3 mL, 45 mmol), toluene (4 mL), and methyl acrylate (2.2 mL, 27 mmol). The mixture was heated at 100° C. for 18 hours at which time TLC analysis showed the reaction was still incomplete. Additional portions of palladium acetate (215 mg, 0.958 mmol), tri-o-tolylphosphine (290 mg, 0.953 mmol), triethylamine (3.3 mL, 45 mmol) and methyl acrylate (2.2 mL, 27 mmol) were added, and the mixture was heated at 110° for a further 18 hours. After cooling to room temperature the mixture was poured into water and extracted with ethyl acetate (3×100 mL). The combined organic extracts were washed sequentially with water and brine, and then dried (MgSO4) and concentrated to a brown oil (5.3 g). The oil was chromatographed over silica gel. Elution with ethyl acetate/hexanes (1:9) afforded methyl 3-benzoylcinnamate (4.6 g, 91%) as a yellow solid.

Herkunft & Nachweise