4,5-dibromo-3H-2-benzofuran-1-one

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

Procedure: To a flask charged with 4,5-dibromo-2-benzofuran-1(3H)-one (170 mg, 0.59 mmol) and a stir bar was added allyl tri-n-butyltin (0.18 mL, 0.59 mmol), palladium tetrakis (68 mg, 0.059 mmol), lithium chloride (50 mg, 1.2 mmol), and toluene (5 mL). The mixture was sealed with a condensor, purged three times with nitrogen, and heated to reflux for 16 hours. The reaction was diluted with EtOAc (50 mL), adsorbed onto silica gel, and purified by silica gel flash chromatography to afford 5-allyl-4-bromo-2-benzofuran-1(3H)-one. LC-MS (IE, m/z): 253 [M+1]+; The mixture was sealed with a condensor purged three times with nitrogen heated to reflux for 16 hours The reaction was diluted with EtOAc (50 mL) purified by silica gel flash chromatography

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

Procedure: To a flask containing a stir bar was added 5-bromo-2-benzofuran-1(3H)-one (12.0 g, 56.3 mmol) and NBS (15 g, 84 mmol). Triflic acid (50 mL) was then added at 0° C. and the resulting mixture was allowed to warm to rt and stir for 2 days. TLC analysis of the reaction mixture showed complete reaction. The reaction mixture was poured into ice and the organic layer was separated, washed with brine, water, dried over Na2SO4, filtered, and concentrated to dryness. The residue was then absorbed into silica gel and subjected for purification over a silica MPLC column to give 4,5-dibromo-2-benzofuran-1(3H)-one. LC-MS (IE, m/z): 291 [M+1]+. To a flask containing a stir bar reaction The reaction mixture was poured into ice the organic layer was separated washed with brine, water dried over Na2SO4 filtered concentrated to dryness The residue was then absorbed into silica gel subjected for purification over a silica MPLC column

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

Procedure: 4,5-Dibromo-2-benzofuran-1(3H)-one (3.00 g, 10.3 mmol), Potassium vinyltrifluoroborate (12.7 g, 20.6 mmol) and Pd(dppf)Cl2 (839 mg, 1.03 mmol) in TEA (2.7 mL) and EtOH (15 mL) were added to a flask containing a stir bar. The flask was then heated at 60° C. for 2 h. TLC showed clean and complete reaction. The organic residue was dissolved in EtOAc (500 mL) and the solution was washed with brine, dried over sodium sulfate, filtered and concentrated. The resulting organic residue was subjected to purification over silica gel to give 4-bromo-5-ethenyl-2-benzofuran-1(3H)-one. containing a stir bar complete reaction the solution was washed with brine dried over sodium sulfate filtered concentrated The resulting organic residue was subjected to purification over silica gel

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

Procedure: To a flask containing a stir bar was added commercially available 5-bromo-2-benzofuran-1(3H)-one (12.0 g, 56.3 mmol) and NBS (15 g, 84 mmol). Triflic acid (50 mL) was added at 0° C. and the resulting mixture was stirred for 2 days. TLC analysis of the reaction mixture showed a complete reaction; the reaction mixture was poured into an ice and the organic layer separated. The organic layer was washed with aq. NaCl, water, dried over Na2SO4, filtered and concentrated to dryness, it was then absorbed onto silica gel and subjected for purification over a silica column to give the title compound. To a flask containing a stir bar a complete reaction the organic layer separated The organic layer was washed with aq. NaCl, water dried over Na2SO4 filtered concentrated to dryness, it was then absorbed onto silica gel subjected for purification over a silica column

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

Procedure: 4,5-Dibromo-2-benzofuran-1(3H)-one (3.00 g, 10.3 mmol), potassium vinyltrifluoroborate (12.7 g, 20.6 mmol) and Pd(dppf)Cl2 (839 mg, 1.03 mmol) in TEA (2.7 mL) and EtOH (15 mL) were heated at 60° C. for 2 h. Analysis by TLC showed clean and complete reaction. The reaction mixture was diluted with EtOAc (500 mL), washed with brine, dried over sodium sulfate, filtered, and concentrated. The resulting residue was subjected to purification over silica gel to give 4-bromo-5-ethenyl-2-benzofuran-1(3H)-one. complete reaction washed with brine dried over sodium sulfate filtered concentrated The resulting residue was subjected to purification over silica gel

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

Procedure: To a flask containing a stir bar was added 5-bromo-2-benzofuran-1(3H)-one (12.0 g, 56.3 mmol) and NBS (15 g, 84 mmol). Triflic acid (50 mL) was then added at 0° C. and the resulting mixture was allowed to warm to rt and stir for 2 days. TLC analysis of the reaction mixture showed complete reaction. The reaction mixture was poured into ice and the organic layer was separated, washed with brine, water, dried over Na2SO4, filtered, and concentrated to dryness. The residue was then absorbed into silica gel and subjected for purification over a silica MPLC column to give 4,5-dibromo-2-benzofuran-1(3H)-one. LC-MS: M+1=291 To a flask containing a stir bar reaction The reaction mixture was poured into ice the organic layer was separated washed with brine, water dried over Na2SO4 filtered concentrated to dryness The residue was then absorbed into silica gel subjected for purification over a silica MPLC column

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

Procedure: 4,5-Dibromo-2-benzofuran-1(3H)-one (3.00 g, 10.3 mmol), potassium vinyltrifluoroborate (12.7 g, 20.6 mmol) and Pd (dppf)Cl2 (839 mg, 1.03 mmol) in TEA (2.7 mL) and EtOH (15 mL) were heated at 60° C. for 2 h. Analysis by TLC showed clean and complete reaction. The reaction mixture was diluted with EtOAc (500 mL), washed with brine, dried over sodium sulfate, filtered, and concentrated. The resulting residue was subjected to purification over silica gel to give 4-bromo-5-ethenyl-2-benzofuran-1(3H)-one. complete reaction washed with brine dried over sodium sulfate filtered concentrated The resulting residue was subjected to purification over silica gel

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

Procedure: To a flask containing a stir bar was added 5-bromo-2-benzofuran-1(3H)-one (12.0 g, 56.3 mmol) and NBS (15 g, 84 mmol). Triflic acid (50 mL) was then added at 0° C. and the resulting mixture was allowed to warm to rt and stir for 2 days. TLC analysis of the reaction mixture showed complete reaction. The reaction mixture was poured into ice and the organic layer was separated, washed with brine, water, dried over Na2SO4, filtered, and concentrated to dryness. The residue was then absorbed into silica gel and subjected for purification over a silica MPLC column to give 4,5-dibromo-2-benzofuran-1(3H)-one. LC-MS: M+1=291 To a flask containing a stir bar reaction The reaction mixture was poured into ice the organic layer was separated washed with brine, water dried over Na2SO4 filtered concentrated to dryness The residue was then absorbed into silica gel subjected for purification over a silica MPLC column