1-(7-bromo-1-benzofuran-2-yl)ethanone

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: To a mixture of 57 mg (0.049 mmol, 5%) of Pd(PPh3)4, 362 mg (1.26 mmol) of 2-acetyl-7-bromobenzo[b]furan and 2.52 mmol of 2-propoxy-3-tert-butyl-5-ethyl phenylboronic acid in 10 mL of toluene, and 5 mL of ethanol was added 1.3 mL of a 2N Na2CO3 aqueous solution. The mixture was heated to reflux for 3 hours and after cooling (room temperature) extracted with ethyl acetate. The organic layer was dried over MgSO4 and the solvents were removed under reduced pressure. The crude product was filtrated over a short silica plug (eluent: ethyl acetate/hexane: 10/90) and recrystallized from hexane to afford 2-acetyl-7-(2-propoxy-3-tert-butyl-5-ethylphenyl)benzo[b]furan as a white solid. The mixture was heated to reflux for 3 hours extracted with ethyl acetate The organic layer was dried over MgSO4 the solvents were removed under reduced pressure The crude product was filtrated over a short silica plug (eluent: ethyl acetate/hexane: 10/90) recrystallized from hexane

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 5.0 g (24.9 mmol) of 3-bromo-salicylaldehyde, 3.0 g (32.3 mmol, 2.6 mL) of chloroacetone and 12 g (37.2 mmol) of Cs2CO3 in 30 mL of dry DMF was heated to 60° C. overnight. After cooling at room temperature, water (100 mL) was added and the mixture was extracted with ethyl acetate. The organic layer was dried over MgSO4 and the solvents were removed under reduced pressure. The crude product was directly recrystallized from hexane to afford 2-acetyl-7-bromo benzo[b]furan as a pale orange crystal. After cooling at room temperature the mixture was extracted with ethyl acetate The organic layer was dried over MgSO4 the solvents were removed under reduced pressure The crude product was directly recrystallized from hexane