1-溴-2-(2,2-二乙氧基乙氧基)苯

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A stirred mixture of polyphosphoric acid (˜5 g) and chlorobenzene (8 mL) was heated at reflux and a solution of 1-(2,2-diethoxyethoxy)-2-bromobenzene (2.62 g, 9.0 mmol) in chlorobenzene (3 mL) was added dropwise over 10 min. The mixture was heated at reflux for 1.5 h. The mixture was allowed to cool to rt and 1 M aq NaOH (20 mL) was added, followed by ether (175 mL). The mixture was washed with water (2×20 mL) and brine (20 mL), and dried over MgSO4. Evaporation of the solvent left a residue which was purified by a chromatography on a 140-g silica cartridge eluted with hexanes and a 0-10% EtOAc in hexanes gradient. Appropriate fractions were pooled and concentrated to afford 7-bromobenzofuran (0.65 g, 38% from 2-bromophenol) as a clear colorless oil. was heated at reflux The mixture was heated at reflux for 1.5 h The mixture was washed with water (2×20 mL) and brine (20 mL) dried over MgSO4 Evaporation of the solvent left a residue which was purified by a chromatography on a 140-g silica cartridge eluted with hexanes concentrated

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A stirred mixture of polyphosphoric acid (˜5 g) and chlorobenzene (8 mL) was heated at reflux and a solution of 1-(2,2-diethoxyethoxy)-2-bromobenzene (2.62 g, 9.0 mmol) in chlorobenzene (3 mL) was added dropwise over 10 min. The mixture was heated at reflux for 1.5 h. The mixture was allowed to cool to rt and 1 M aq NaOH (20 mL) was added, followed by ether (175 mL). The mixture was washed with water (2×20 mL) and brine (20 mL), and dried over MgSO4. Evaporation of the solvent left a residue which was purified by a chromatography on a 140-g silica cartridge eluted with hexanes and a 0-10% EtOAc in hexanes gradient. Appropriate fractions were pooled and concentrated to afford 7-bromobenzofuran (0.65 g, 38% from 2-bromophenol) as a clear colorless oil. was heated at reflux The mixture was heated at reflux for 1.5 h The mixture was washed with water (2×20 mL) and brine (20 mL) dried over MgSO4 Evaporation of the solvent left a residue which was purified by a chromatography on a 140-g silica cartridge eluted with hexanes concentrated

反应条件: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of KOH pellets (85%, 0.68 g, 10.3 mmol) in water (1.5 mL) was added to 2-bromophenol (1 mL, 8.6 mmol). The mixture was diluted with DMSO (20 mL) and bromoacetaldehyde diethyl acetal (1.43 mL, 9.5 mmol) was added. The mixture was heated at 100° C. for 6 h, cooled to rt, diluted with ether (175 mL), washed with water (3×40 mL) and 5% aq NaOH (40 mL), and dried over MgSO4. Removal of the solvent left 1-(2,2-diethoxyethoxy)-2-bromobenzene (2.62 g, quant) as an oil. was added cooled to rt washed with water (3×40 mL) and 5% aq NaOH (40 mL) dried over MgSO4 Removal of the solvent left 1-(2,2-diethoxyethoxy)-2-bromobenzene (2.62 g, quant) as an oil

反应条件: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of KOH pellets (85%, 0.68 g, 10.3 mmol) in water (1.5 mL) was added to 2-bromophenol (1 mL, 8.6 mmol). The mixture was diluted with DMSO (20 mL) and bromoacetaldehyde diethyl acetal (1.43 mL, 9.5 mmol) was added. The mixture was heated at 100° C. for 6 h, cooled to rt, diluted with ether (175 mL), washed with water (3×40 mL) and 5% aq NaOH (40 mL), and dried over MgSO4. Removal of the solvent left 1-(2,2-diethoxyethoxy)-2-bromobenzene (2.62 g, quant) as an oil. was added cooled to rt washed with water (3×40 mL) and 5% aq NaOH (40 mL) dried over MgSO4 Removal of the solvent left 1-(2,2-diethoxyethoxy)-2-bromobenzene (2.62 g, quant) as an oil

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A stirred mixture of polyphosphoric acid (˜5 g) and chlorobenzene (8 mL) was heated at reflux and a solution of 1-(2,2-diethoxyethoxy)-2-bromobenzene (2.62 g, 9.0 mmol) in chlorobenzene (3 mL) was added dropwise over 10 min. The mixture was heated at reflux for 1.5 h. The mixture was allowed to cool to rt and 1M aq NaOH (20 mL) was added, followed by ether (175 mL). The mixture was washed with water (2×20 mL) and brine (20 mL), and dried over MgSO4. Evaporation of the solvent left a residue which was purified by a chromatography on a 140-g silica cartridge eluted with hexanes and a 0-10% EtOAc in hexanes gradient. Appropriate fractions were pooled and concentrated to afford 7-bromobenzofuran (0.65 g, 38% from 2-bromophenol) as a clear colorless oil. was heated at reflux The mixture was heated at reflux for 1.5 h The mixture was washed with water (2×20 mL) and brine (20 mL) dried over MgSO4 Evaporation of the solvent left a residue which was purified by a chromatography on a 140-g silica cartridge eluted with hexanes concentrated

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A stirred mixture of polyphosphoric acid (˜5 g) and chlorobenzene (8 mL) was heated at reflux and a solution of 1-(2,2-diethoxyethoxy)-2-bromobenzene (2.62 g, 9.0 mmol) in chlorobenzene (3 mL) was added dropwise over 10 min. The mixture was heated at reflux for 1.5 h. The mixture was allowed to cool to rt and 1M aq NaOH (20 mL) was added, followed by ether (175 mL). The mixture was washed with water (2×20 mL) and brine (20 mL), and dried over MgSO4. Evaporation of the solvent left a residue which was purified by a chromatography on a 140-g silica cartridge eluted with hexanes and a 0-10% EtOAc in hexanes gradient. Appropriate fractions were pooled and concentrated to afford 7-bromobenzofuran (0.65 g, 38% from 2-bromophenol) as a clear colorless oil. was heated at reflux The mixture was heated at reflux for 1.5 h The mixture was washed with water (2×20 mL) and brine (20 mL) dried over MgSO4 Evaporation of the solvent left a residue which was purified by a chromatography on a 140-g silica cartridge eluted with hexanes concentrated

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A stirred mixture of polyphosphoric acid (˜5 g) and chlorobenzene (8 mL) was heated at reflux and a solution of 1-(2,2-diethoxyethoxy)-2-bromobenzene (2.62 g, 9.0 mmol) in chlorobenzene (3 mL) was added dropwise over 10 min. The mixture was heated at reflux for 1.5 h. The mixture was allowed to cool to rt and 1M aq NaOH (20 mL) was added, followed by ether (175 mL). The mixture was washed with water (2×20 mL) and brine (20 mL), and dried over MgSO4. Evaporation of the solvent left a residue which was purified by a chromatography on a 140-g silica cartridge eluted with hexanes and a 0-10% EtOAc in hexanes gradient. Appropriate fractions were pooled and concentrated to afford 7-bromobenzofuran (0.65 g, 38% from 2-bromophenol) as a clear colorless oil. was heated at reflux The mixture was heated at reflux for 1.5 h The mixture was washed with water (2×20 mL) and brine (20 mL) dried over MgSO4 Evaporation of the solvent left a residue which was purified by a chromatography on a 140-g silica cartridge eluted with hexanes concentrated

反应条件: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of KOH pellets (85%, 0.68 g, 10.3 mmol) in water (1.5 mL) was added to 2-bromophenol (1 mL, 8.6 mmol). The mixture was diluted with DMSO (20 mL) and bromoacetaldehyde diethyl acetal (1.43 mL, 9.5 mmol) was added. The mixture was heated at 100° C. for 6 h, cooled to rt, diluted with ether (175 mL), washed with water (3×40 mL) and 5% aq NaOH (40 mL), and dried over MgSO4. Removal of the solvent left 1-(2,2-diethoxyethoxy)-2-bromobenzene (2.62 g, quant) as an oil. was added cooled to rt washed with water (3×40 mL) and 5% aq NaOH (40 mL) dried over MgSO4 Removal of the solvent left 1-(2,2-diethoxyethoxy)-2-bromobenzene (2.62 g, quant) as an oil