8-bromo-1,3,4,5-tetrahydro-1-benzazepin-2-one

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

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

Procedure: To a solution of 8-bromo-1,3,4,5-tetrahydro-2H-1-benzazepin-2-one (500 mg, 2.082 mmol) in THF (20 mL) at RT was added borane-THF complex (1M solution in THF) (5.206 mL, 5.21 mmol). The reaction mixture was refluxed for 3 hours, after which the reaction mixture was cooled in an ice bath before the addition of a further amount of borane-THF complex (1M solution in THF) (7.290 mL, 7.29 mmol). The reaction mixture was once again refluxed overnight. The reaction mixture was cooled in an ice bath before the dropwise addition of water. The aqueous layer was then extracted with diethyl ether (3×25 mL). The organic layers were combined, passed through a hydrophobic frit and concentrated. This residue was purified on silica column eluting with ethyl acetate in cyclohexane (0-15%) to afford the title compound (400 mg). LCMS (A): m/z (M+H)+ 226/228, C10H12BrN requires 225/227 (acidic). The reaction mixture was refluxed for 3 hours The aqueous layer was then extracted with diethyl ether (3×25 mL) concentrated This residue was purified on silica column eluting with ethyl acetate in cyclohexane (0-15%)

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

Procedure: To a solution of 8-bromo-1,3,4,5-tetrahydro-2H-1-benzazepin-2-one (500 mg, 2.082 mmol) in THF (20 mL) at RT was added borane-THF complex (1M solution in THF) (5.206 mL, 5.21 mmol). The reaction mixture was refluxed for 3 hours, after which the reaction mixture was cooled in an ice bath before the addition of a further amount of borane-THF complex (1M solution in THF) (7.290 mL, 7.29 mmol). The reaction mixture was once again refluxed overnight. The reaction mixture was cooled in an ice bath before the dropwise addition of water. The aqueous layer was then extracted with diethyl ether (3×25 mL). The organic layers were combined, passed through a hydrophobic frit and concentrated. This residue was purified on silica column eluting with ethyl acetate in cyclohexane (0-15%) to afford the title compound (400 mg). LCMS (A): m/z (M+H)+ 226/228, C10H12BrN requires 225/227 (acidic). The reaction mixture was refluxed for 3 hours The aqueous layer was then extracted with diethyl ether (3×25 mL) concentrated This residue was purified on silica column eluting with ethyl acetate in cyclohexane (0-15%)

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

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

Procedure: Borane tetrahydrofuran complex (1 M solution in tetrahydrofuran, 21 mL, 21 mmol) was added to a solution of 8-bromo-1,3,4,5-tetrahydro-benzo[b]azepin-2-one (prepared from 7-bromo-3,4-dihydro-2H-naphthalen-1-one in analogy with the general procedure described in J Chem. Soc. (C) 1969, 183; 1.00 g, 4.17 mmol) in tetrahydrofuran, and the solution was heated at reflux for 2 h. After cooling, methanol (21 mL) was added, and volatile material was removed by distillation. The residue was taken up in 5% ethanolic sulfuric acid solution (12 mL) and heated at reflux for 2 h, then basified to pH 10 by addition of 2 M aq. sodium hydroxide solution and partitioned between water and ethyl acetate. The organic layer was dried (MgSO4) and evaporated. Chromatography (SiO2, heptane-ethyl acetate 2:1) yielded 8-bromo-2,3,4,5-tetrahydro-1H-benzo[b]azepine (865 mg, 92%). White solid, MS (ISP) m/e 226.1 (M+H). at reflux for 2 h After cooling volatile material was removed by distillation heated at reflux for 2 h basified to pH 10 by addition of 2 M aq. sodium hydroxide solution partitioned between water and ethyl acetate The organic layer was dried (MgSO4) evaporated

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

Procedure: Borane tetrahydrofuran complex (1 M solution in tetrahydrofuran, 21 mL, 21 mmol) was added to a solution of 8-bromo-1,3,4,5-tetrahydro-benzo[b]azepin-2-one (prepared from 7-bromo-3,4-dihydro-2H-naphthalen-1-one in analogy with the general procedure described in J Chem. Soc. (C) 1969, 183; 1.00 g, 4.17 mmol) in tetrahydrofuran, and the solution was heated at reflux for 2 h. After cooling, methanol (21 mL) was added, and volatile material was removed by distillation. The residue was taken up in 5% ethanolic sulfuric acid solution (12 mL) and heated at reflux for 2 h, then basified to pH 10 by addition of 2 M aq. sodium hydroxide solution and partitioned between water and ethyl acetate. The organic layer was dried (MgSO4) and evaporated. Chromatography (SiO2, heptane-ethyl acetate 2:1) yielded 8-bromo-2,3,4,5-tetrahydro-1H-benzo[b]azepine (865 mg, 92%). White solid, MS (ISP) m/e 226.1 (M+H). at reflux for 2 h After cooling volatile material was removed by distillation heated at reflux for 2 h basified to pH 10 by addition of 2 M aq. sodium hydroxide solution partitioned between water and ethyl acetate The organic layer was dried (MgSO4) evaporated

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

Procedure: Borane tetrahydrofuran complex (1 M solution in tetrahydrofuran, 21 mL, 21 mmol) was added to a solution of 8-bromo-1,3,4,5-tetrahydro-benzo[b]azepin-2-one (prepared from 7-bromo-3,4-dihydro-2H-naphthalen-1-one in analogy with the general procedure described in J Chem. Soc. (C) 1969, 183; 1.00 g, 4.17 mmol) in tetrahydrofuran, and the solution was heated at reflux for 2 h. After cooling, methanol (21 mL) was added, and volatile material was removed by distillation. The residue was taken up in 5% ethanolic sulfuric acid solution (12 mL) and heated at reflux for 2 h, then basified to pH 10 by addition of 2 M aq. sodium hydroxide solution and partitioned between water and ethyl acetate. The organic layer was dried (MgSO4) and evaporated. Chromatography (SiO2, heptane-ethyl acetate 2:1) yielded 8-bromo-2,3,4,5-tetrahydro-1H-benzo[b]azepine (865 mg, 92%). White solid, MS (ISP) m/e 226.1 (M+H). at reflux for 2 h After cooling volatile material was removed by distillation heated at reflux for 2 h basified to pH 10 by addition of 2 M aq. sodium hydroxide solution partitioned between water and ethyl acetate The organic layer was dried (MgSO4) evaporated

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

Procedure: Borane tetrahydrofuran complex (1 M solution in tetrahydrofuran, 21 mL, 21 mmol) was added to a solution of 8-bromo-1,3,4,5-tetrahydro-benzo[b]azepin-2-one (prepared from 7-bromo-3,4-dihydro-2H-naphthalen-1-one in analogy with the general procedure described in J Chem. Soc. (C) 1969, 183; 1.00 g, 4.17 mmol) in tetrahydrofuran, and the solution was heated at reflux for 2 h. After cooling, methanol (21 mL) was added, and volatile material was removed by distillation. The residue was taken up in 5% ethanolic sulfuric acid solution (12 mL) and heated at reflux for 2 h, then basified to pH 10 by addition of 2 M aq. sodium hydroxide solution and partitioned between water and ethyl acetate. The organic layer was dried (MgSO4) and evaporated. Chromatography (SiO2, heptane-ethyl acetate 2:1) yielded 8-bromo-2,3,4,5-tetrahydro-1H-benzo[b]azepine (865 mg, 92%). White solid, MS (ISP) m/e=226.1 (M+H). at reflux for 2 h After cooling volatile material was removed by distillation heated at reflux for 2 h basified to pH 10 by addition of 2 M aq. sodium hydroxide solution partitioned between water and ethyl acetate The organic layer was dried (MgSO4) evaporated

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

Procedure: To a solution of 8-bromo-1,3,4,5-tetrahydro-2H-1-benzazepin-2-one (500 mg, 2.082 mmol) in THF (20 mL) at RT was added borane-THF complex (1M solution in THF) (5.206 mL, 5.21 mmol). The reaction mixture was refluxed for 3 hours, after which the reaction mixture was cooled in an ice bath before the addition of a further amount of borane-THF complex (1M solution in THF) (7.290 mL, 7.29 mmol). The reaction mixture was once again refluxed overnight. The reaction mixture was cooled in an ice bath before the dropwise addition of water. The aqueous layer was then extracted with diethyl ether (3×25 mL). The organic layers were combined, passed through a hydrophobic frit and concentrated. This residue was purified on silica column eluting with ethyl acetate in cyclohexane (0-15%) to afford the title compound (400 mg). LCMS (A): m/z (M+H)+ 226/228, C10H12BrN requires 225/227 (acidic). The reaction mixture was refluxed for 3 hours The aqueous layer was then extracted with diethyl ether (3×25 mL) concentrated This residue was purified on silica column eluting with ethyl acetate in cyclohexane (0-15%)