methyl (E)-3-(3-fluoro-4-formylphenyl)prop-2-enoate

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4-Bromo-2-fluorobenzaldehyde (20.88 g, 102.87 mmol) and methyl acrylate (13.98 ml, 154.30 mmol) were taken up in thoroughly degassed DMA (150 nil) and tri-o-tolylphosphine (3.13 g, 10.29 mmol), palladium(II) acetate (1.155 g, 5.14 mmol) and triethylamine (28.7 ml, 205.74 mmol) added. The reaction was stirred and heated to 100° C. for 16 hours. More tri-o-tolylphosphine (3.13 g, 10.29 mmol) and palladium(II) acetate (1.155 g, 5.14 mmol) were added and the reaction mixture was heated to 110° C. for a further 2 hours. Water (1 L) was added and the reaction mixture extracted with DCM (2×500 ml). Combined organics were dried (MgSO4), filtered and evaporated to give a brown solid. The crude product was purified by flash silica chromatography, elution gradient 0 to 25% EtOAc in heptane. Pure fractions were evaporated to dryness to afford (E)-methyl 3-(3-fluoro-4-formylphenyl)acrylate (15.20 g. 71.0%) as a yellow solid. added the reaction mixture was heated to 110° C. for a further 2 hours the reaction mixture extracted with DCM (2×500 ml) Combined organics were dried (MgSO4) filtered evaporated to give a brown solid The crude product was purified by flash silica chromatography, elution gradient 0 to 25% EtOAc in heptane Pure fractions were evaporated to dryness