4-bromo-3H-2-benzofuran-1-one

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

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

Procedure: A solution of 4-bromo-2-benzofuran-1(3H)-one (4.02 g, 18.9 mmol) in aqueous sodium hydroxide solution (1M, 18.9 ml) was heated at 100° C. for 1 h. The solution was concentrated in vacuo and the residue was dissolved in toluene and re-concentrated. To a solution of the residue in N,N-dimethylformamide (20 ml) was added benzyl bromide (2.26 ml, 18.90 mmol) and the reaction mixture was stirred at room temperature for 14 days. The mixture was poured into water and the resulting precipitate was collected by filtration, washed with water and pentane and dried to give the title compound (4.77 g). The solution was concentrated in vacuo the residue was dissolved in toluene re-concentrated the resulting precipitate was collected by filtration washed with water and pentane dried

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

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirring solution of 3,4-dimethoxy-2-(methoxymethyl)phenylboronic acid (compound 301)(2.3 g, 10.79 mmol) in dimethylformamide (25 mL) under nitrogen atmosphere, were added cesium carbonate (10.52 g, 32.31 mmol), tetrakis(triphenylphosphine)palladium(0) (623 mg, 0.539 mmol) and 4-bromoisobenzofuran-1(3H)-one (5.2 g, 21.5 mmol) and the resultant reaction mixture was heated to 80° C. for 3 h. The reaction mixture was filtered off and the filtrate was extracted with ethyl acetate (3×). The combined ethyl acetate layer was washed with brine and dried over anhydrous sodium sulphate and concentrated under reduced pressure. Purification by column chromatography (silica gel, 0-30% ethyl acetate in pet ether) afforded 4-(3,4-dimethoxy-2-methoxymethoxy-phenyl)-3H-isobenzofuran-1-one as a solid. the resultant reaction mixture The reaction mixture was filtered off the filtrate was extracted with ethyl acetate (3×) The combined ethyl acetate layer was washed with brine dried over anhydrous sodium sulphate concentrated under reduced pressure Purification by column chromatography (silica gel, 0-30% ethyl acetate in pet ether)

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

Procedure: To a stirring solution of 3-Bromo-2-methyl-benzoic acid methyl ester (500 mg, 2.22 mmol) in carbon tetrachloride (6 mL) at 0° C., was added chromylchloride (0.36 mL, 4.45 mmol) and the reaction mixture was heated to reflux for 20 h. The reaction mixture was cooled to RT, added ice water and sat sodium bicarbonate solution at 0° C. Extracted with ethyl acetate (3×) the combined ethyl acetate layer was washed with brine and dried over anhydrous sodium sulphate and concentrated under reduced pressure. Purification by column chromatography (silica gel, 0-10% ethyl acetate in pet. ether) afforded 4-bromo-3H-isobenzofuran-1-one as a solid. the reaction mixture was heated to reflux for 20 h at 0° C Extracted with ethyl acetate (3×) the combined ethyl acetate layer was washed with brine dried over anhydrous sodium sulphate concentrated under reduced pressure Purification by column chromatography (silica gel, 0-10% ethyl acetate in pet. ether)

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

Procedure: A solution of 4-bromo-2-benzofuran-1(3H)-one (4.02 g, 18.9 mmol) in aqueous sodium hydroxide solution (1M, 18.9 ml) was heated at 100° C. for 1 h. The solution was concentrated in vacuo and the residue was dissolved in toluene and re-concentrated. To a solution of the residue in N,N-dimethylformamide (20 ml) was added benzyl bromide (2.26 ml, 18.90 mmol) and the reaction mixture was stirred at room temperature for 14 days. The mixture was poured into water and the resulting precipitate was collected by filtration, washed with water and pentane and dried to give the title compound (4.77 g). The solution was concentrated in vacuo the residue was dissolved in toluene re-concentrated the resulting precipitate was collected by filtration washed with water and pentane dried

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

Procedure: A solution of 4-bromo-2-benzofuran-1(3H)-one (4.02 g, 18.9 mmol) in aqueous sodium hydroxide solution (1M, 18.9 ml) was heated at 100° C. for 1 h. The solution was concentrated in vacuo and the residue was dissolved in toluene and re-concentrated. To a solution of the residue in N,N-dimethylformamide (20 ml) was added benzyl bromide (2.26 ml, 18.90 mmol) and the reaction mixture was stirred at room temperature for 14 days. The mixture was poured into water and the resulting precipitate was collected by filtration, washed with water and pentane and dried to give the title compound (4.77 g). The solution was concentrated in vacuo the residue was dissolved in toluene re-concentrated the resulting precipitate was collected by filtration washed with water and pentane dried

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

Procedure: A solution of 4-bromo-2-benzofuran-1(3H)-one (4.02 g, 18.9 mmol) in aqueous sodium hydroxide solution (1M, 18.9 ml) was heated at 100° C. for 1 h. The solution was concentrated in vacuo and the residue was dissolved in toluene and re-concentrated. To a solution of the residue in N,N-dimethylformamide (20 ml) was added benzyl bromide (2.26 ml, 18.90 mmol) and the reaction mixture was stirred at room temperature for 14 days. The mixture was poured into water and the resulting precipitate was collected by filtration, washed with water and pentane and dried to give the title compound (4.77 g). The solution was concentrated in vacuo the residue was dissolved in toluene re-concentrated the resulting precipitate was collected by filtration washed with water and pentane dried

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

Procedure: A solution of 4-bromo-2-benzofuran-1(3H)-one (4.02 g, 18.9 mmol) in aqueous sodium hydroxide solution (1M, 18.9 ml) was heated at 100° C. for 1 h. The solution was concentrated in vacuo and the residue was dissolved in toluene and re-concentrated. To a solution of the residue in N,N-dimethylformamide (20 ml) was added benzyl bromide (2.26 ml, 18.90 mmol) and the reaction mixture was stirred at room temperature for 14 days. The mixture was poured into water and the resulting precipitate was collected by filtration, washed with water and pentane and dried to give the title compound (4.77 g). The solution was concentrated in vacuo the residue was dissolved in toluene re-concentrated the resulting precipitate was collected by filtration washed with water and pentane dried