2-(4-bromo-2-chlorophenyl)ethanamine

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

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

Procedure: To a stirred solution of 4-(6-chloro-4-(ethoxycarbonyl)chroman-7-yloxy)benzoic acid (Preparation 1) (1.15 g. 3.05 mmol), 1-hydroxybenzotriazole hydrate (0.51 g, 3.4 mmol) and 2-(4-bromo-2-chlorophenyl)ethanamine (0.75 g, 3.2 mmol) in N,N-dimethylformamide (10 mL) at ambient temperature was added solid 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride (0.70 g, 3.7 mmol). The resulting solution was stirred at ambient temperature for 17 hours, then diluted with water (100 mL) and extracted with ethyl acetate (100 mL). Addition of 1M hydrochloric acid (20 mL) enabled layer separation. The organic layer was dried over sodium sulfate and concentrated. The residue was purified by chromatography on silica gel, eluting with 75/25 hexanes/ethyl acetate, to afford ethyl 7-(4-(4-bromo-2-chlorophenethylcarbamoyl)phenoxy)-6-chlorochroman-4-carboxylate as an off-white solid (1.10 g, 60% yield). extracted with ethyl acetate (100 mL) Addition of 1M hydrochloric acid (20 mL) layer separation The organic layer was dried over sodium sulfate concentrated The residue was purified by chromatography on silica gel eluting with 75/25 hexanes/ethyl acetate

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

Procedure: To a stirred suspension of lithium borohydride (0.29 g, 13 mmol) in tetrahydrofuran (20 mL) at ambient temperature was added chlorotrimethylsilane (3.4 mL, 27 mmol), dropwise over 2 minutes. After stirring at ambient temperature for 20 minutes, argon gas was bubbled through the mixture for 2 minutes to remove the remaining trimethylsilane that had formed. A solution of 4-bromo-2-chloro-1-(2-nitrovinyl)benzene (0.88 g, 3.4 mmol) in tetrahydrofuran (15 mL) was added dropwise over 4 minutes with stirring at ambient temperature. The resulting mixture was stirred and heated to reflux for 1 hour. The mixture was cooled in an ice bath and carefully quenched with methanol (20 mL). The solvent was evaporated, and the residue was partitioned between 20% potassium hydroxide (40 mL) and dichloromethane (20 mL). The organic layer was dried over sodium sulfate and concentrated to afford 2-(4-bromo-2-chlorophenyl)ethanamine as a light yellow oil (0.75 g, 95% yield). argon gas was bubbled through the mixture for 2 minutes to remove the remaining trimethylsilane that had formed with stirring at ambient temperature The resulting mixture was stirred heated to reflux for 1 hour The mixture was cooled in an ice bath carefully quenched with methanol (20 mL) The solvent was evaporated the residue was partitioned between 20% potassium hydroxide (40 mL) and dichloromethane (20 mL) The organic layer was dried over sodium sulfate concentrated

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

Procedure: To a stirred solution of 4-(6-chloro-4-(ethoxycarbonyl)chroman-7-yloxy)benzoic acid (Preparation 1) (1.15 g. 3.05 mmol), 1-hydroxybenzotriazole hydrate (0.51 g, 3.4 mmol) and 2-(4-bromo-2-chlorophenyl)ethanamine (0.75 g, 3.2 mmol) in N,N-dimethylformamide (10 mL) at ambient temperature was added solid 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride (0.70 g, 3.7 mmol). The resulting solution was stirred at ambient temperature for 17 hours, then diluted with water (100 mL) and extracted with ethyl acetate (100 mL). Addition of 1M hydrochloric acid (20 mL) enabled layer separation. The organic layer was dried over sodium sulfate and concentrated. The residue was purified by chromatography on silica gel, eluting with 75/25 hexanes/ethyl acetate, to afford ethyl 7-(4-(4-bromo-2-chlorophenethylcarbamoyl)phenoxy)-6-chlorochroman-4-carboxylate as an off-white solid (1.10 g, 60% yield). extracted with ethyl acetate (100 mL) Addition of 1M hydrochloric acid (20 mL) layer separation The organic layer was dried over sodium sulfate concentrated The residue was purified by chromatography on silica gel eluting with 75/25 hexanes/ethyl acetate

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

Procedure: To a stirred suspension of lithium borohydride (0.29 g, 13 mmol) in tetrahydrofuran (20 mL) at ambient temperature was added chlorotrimethylsilane (3.4 mL, 27 mmol), dropwise over 2 minutes. After stirring at ambient temperature for 20 minutes, argon gas was bubbled through the mixture for 2 minutes to remove the remaining trimethylsilane that had formed. A solution of 4-bromo-2-chloro-1-(2-nitrovinyl)benzene (0.88 g, 3.4 mmol) in tetrahydrofuran (15 mL) was added dropwise over 4 minutes with stirring at ambient temperature. The resulting mixture was stirred and heated to reflux for 1 hour. The mixture was cooled in an ice bath and carefully quenched with methanol (20 mL). The solvent was evaporated, and the residue was partitioned between 20% potassium hydroxide (40 mL) and dichloromethane (20 mL) The organic layer was dried over sodium sulfate and concentrated to afford 2-(4-bromo-2-chlorophenyl)ethanamine as a light yellow oil (0.75 g, 95% yield). argon gas was bubbled through the mixture for 2 minutes to remove the remaining trimethylsilane that had formed with stirring at ambient temperature The resulting mixture was stirred heated to reflux for 1 hour The mixture was cooled in an ice bath carefully quenched with methanol (20 mL) The solvent was evaporated the residue was partitioned between 20% potassium hydroxide (40 mL) and dichloromethane (20 mL) The organic layer was dried over sodium sulfate concentrated

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

Procedure: To a stirred solution of 4-(6-chloro-4-(ethoxycarbonyl)chroman-7-yloxy)benzoic acid (Preparation 1) (1.15 g. 3.05 mmol), 1-hydroxybenzotriazole hydrate (0.51 g, 3.4 mmol) and 2-(4-bromo-2-chlorophenyl)ethanamine (0.75 g, 3.2 mmol) in N,N-dimethylformamide (10 mL) at ambient temperature was added solid 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride (0.70 g, 3.7 mmol). The resulting solution was stirred at ambient temperature for 17 hours, then diluted with water (100 mL) and extracted with ethyl acetate (100 mL). Addition of 1M hydrochloric acid (20 mL) enabled layer separation. The organic layer was dried over sodium sulfate and concentrated. The residue was purified by chromatography on silica gel, eluting with 75/25 hexanes/ethyl acetate, to afford ethyl 7-(4-(4-bromo-2-chlorophenethylcarbamoyl)phenoxy)-6-chlorochroman-4-carboxylate as an off-white solid (1.10 g, 60% yield). extracted with ethyl acetate (100 mL) Addition of 1M hydrochloric acid (20 mL) layer separation The organic layer was dried over sodium sulfate concentrated The residue was purified by chromatography on silica gel eluting with 75/25 hexanes/ethyl acetate

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

Procedure: To a stirred solution of 4-(6-chloro-4-(ethoxycarbonyl)chroman-7-yloxy)benzoic acid (Preparation 1) (1.15 g. 3.05 mmol), 1-hydroxybenzotriazole hydrate (0.51 g, 3.4 mmol) and 2-(4-bromo-2-chlorophenyl)ethanamine (0.75 g, 3.2 mmol) in N,N-dimethylformamide (10 mL) at ambient temperature was added solid 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride (0.70 g, 3.7 mmol). The resulting solution was stirred at ambient temperature for 17 hours, then diluted with water (100 mL) and extracted with ethyl acetate (100 mL). Addition of 1M hydrochloric acid (20 mL) enabled layer separation. The organic layer was dried over sodium sulfate and concentrated. The residue was purified by chromatography on silica gel, eluting with 75/25 hexanes/ethyl acetate, to afford ethyl 7-(4-(4-bromo-2-chlorophenethylcarbamoyl)phenoxy)-6-chlorochroman-4-carboxylate as an off-white solid (1.10 g, 60% yield). extracted with ethyl acetate (100 mL) Addition of 1M hydrochloric acid (20 mL) layer separation The organic layer was dried over sodium sulfate concentrated The residue was purified by chromatography on silica gel eluting with 75/25 hexanes/ethyl acetate

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

Procedure: To a stirred suspension of lithium borohydride (0.29 g, 13 mmol) in tetrahydrofuran (20 mL) at ambient temperature was added chlorotrimethylsilane (3.4 mL, 27 mmol), dropwise over 2 minutes. After stirring at ambient temperature for 20 minutes, argon gas was bubbled through the mixture for 2 minutes to remove the remaining trimethylsilane that had formed. A solution of 4-bromo-2-chloro-1-(2-nitrovinyl)benzene (0.88 g, 3.4 mmol) in tetrahydrofuran (15 mL) was added dropwise over 4 minutes with stirring at ambient temperature. The resulting mixture was stirred and heated to reflux for 1 hour. The mixture was cooled in an ice bath and carefully quenched with methanol (20 mL). The solvent was evaporated, and the residue was partitioned between 20% potassium hydroxide (40 mL) and dichloromethane (20 mL). The organic layer was dried over sodium sulfate and concentrated to afford 2-(4-bromo-2-chlorophenyl)ethanamine as a light yellow oil (0.75 g, 95% yield). argon gas was bubbled through the mixture for 2 minutes to remove the remaining trimethylsilane that had formed with stirring at ambient temperature The resulting mixture was stirred heated to reflux for 1 hour The mixture was cooled in an ice bath carefully quenched with methanol (20 mL) The solvent was evaporated the residue was partitioned between 20% potassium hydroxide (40 mL) and dichloromethane (20 mL) The organic layer was dried over sodium sulfate concentrated

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

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

Procedure: To a stirred suspension of LiBH4 (2.0 M, 73 mL, 145 mmol) in THF (60 mL) at room temperature was added chlorotrimethylsilane (32 g, 290 mmol), dropwise over 10 min. After stirring at room temperature for 20 min, nitrogen gas was bubbled through the mixture for 5 min to remove the remaining trimethylsilane that had formed. A solution of 4-bromo-2-chloro-1-(2-nitrovinyl)benzene (9.5 g, 36.2 mmol) in THF (60 mL) was added dropwise over 10 min with stirring at room temperature. The resulting mixture was heated at reflux for 1 h. The reaction mixture was cooled in an ice bath and carefully quenched with MeOH (100 mL). The solvent was evaporated and the residue was partitioned between 20% KOH (120 mL) and CH2Cl2 (60 mL). The organic layer was dried, concentrated, purified by column chromatography (silica, ethyl acetate/hexanes gradient) to obtain the desired product (8.5 g, 95%) as a light yellow oil: ESI MS m/z 234 [C8H9BrClN+H]+. nitrogen gas was bubbled through the mixture for 5 min to remove the remaining trimethylsilane that had formed with stirring at room temperature The resulting mixture was heated at reflux for 1 h The reaction mixture was cooled in an ice bath carefully quenched with MeOH (100 mL) The solvent was evaporated the residue was partitioned between 20% KOH (120 mL) and CH2Cl2 (60 mL) The organic layer was dried concentrated purified by column chromatography (silica, ethyl acetate/hexanes gradient)

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

Procedure: To a stirred solution of 4-(6-chloro-4-(ethoxycarbonyl)chroman-7-yloxy)benzoic acid (Preparation 1) (1.15 g. 3.05 mmol), 1-hydroxybenzotriazole hydrate (0.51 g, 3.4 mmol) and 2-(4-bromo-2-chlorophenyl)ethanamine (0.75 g, 3.2 mmol) in N,N-dimethylformamide (10 mL) at ambient temperature was added solid 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride (0.70 g, 3.7 mmol). The resulting solution was stirred at ambient temperature for 17 hours, then diluted with water (100 mL) and extracted with ethyl acetate (100 mL). Addition of 1M hydrochloric acid (20 mL) enabled layer separation. The organic layer was dried over sodium sulfate and concentrated. The residue was purified by chromatography on silica gel, eluting with 75/25 hexanes/ethyl acetate, to afford ethyl 7-(4-(4-bromo-2-chlorophenethylcarbamoyl)phenoxy)-6-chlorochroman-4-carboxylate as an off-white solid (1.10 g, 60% yield). extracted with ethyl acetate (100 mL) Addition of 1M hydrochloric acid (20 mL) layer separation The organic layer was dried over sodium sulfate concentrated The residue was purified by chromatography on silica gel eluting with 75/25 hexanes/ethyl acetate

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

Procedure: To a stirred suspension of lithium borohydride (0.29 g, 13 mmol) in tetrahydrofuran (20 mL) at ambient temperature was added chlorotrimethylsilane (3.4 mL, 27 mmol), dropwise over 2 minutes. After stirring at ambient temperature for 20 minutes, argon gas was bubbled through the mixture for 2 minutes to remove the remaining trimethylsilane that had formed. A solution of 4-bromo-2-chloro-1-(2-nitrovinyl)benzene (0.88 g, 3.4 mmol) in tetrahydrofuran (15 mL) was added dropwise over 4 minutes with stirring at ambient temperature. The resulting mixture was stirred and heated to reflux for 1 hour. The mixture was cooled in an ice bath and carefully quenched with methanol (20 mL). The solvent was evaporated, and the residue was partitioned between 20% potassium hydroxide (40 mL) and dichloromethane (20 mL). The organic layer was dried over sodium sulfate and concentrated to afford 2-(4-bromo-2-chlorophenyl)ethanamine as a light yellow oil (0.75 g, 95% yield). argon gas was bubbled through the mixture for 2 minutes to remove the remaining trimethylsilane that had formed with stirring at ambient temperature The resulting mixture was stirred heated to reflux for 1 hour The mixture was cooled in an ice bath carefully quenched with methanol (20 mL) The solvent was evaporated the residue was partitioned between 20% potassium hydroxide (40 mL) and dichloromethane (20 mL) The organic layer was dried over sodium sulfate concentrated