2-bromo-5-chlorophenol

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

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

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

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

Procedure: A mixture of 2-bromo-5-chlorophenol (3.93 g, 18.94 mmol), benzyl bromide (3.42 g, 20 mmol) and potassium carbonate (10 g, 72.46 mmol) in acetone (80 ml) was stirred and refluxed for 3 hours then cooled, evaporated and dissolved in ether/water. The organic phase was dried (magnesium sulphate) evaporated and purified by chromatography on silica eluting with ethyl acetate/iso-hexane (1:99) to give 5.51 g of white solid. refluxed for 3 hours then cooled evaporated dissolved in ether/water The organic phase was dried (magnesium sulphate) evaporated purified by chromatography on silica eluting with ethyl acetate/iso-hexane (1:99)

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

Procedure: A mixture of 2-bromo-5-chlorophenol (3.93 g, 18.94 mmol), benzyl bromide (3.42 g, 20 mmol) and potassium carbonate (10 g, 72.46 mmol) in acetone (80 ml) was stirred and refluxed for 3 hours then cooled, evaporated and dissolved in ether/water. The organic phase was dried (magnesium sulphate) evaporated and purified by chromatography on silica eluting with ethyl acetate/iso-hexane (1:99) to give 5.51 g of white solid. refluxed for 3 hours then cooled evaporated dissolved in ether/water The organic phase was dried (magnesium sulphate) evaporated purified by chromatography on silica eluting with ethyl acetate/iso-hexane (1:99)

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

Procedure: In a similar way as described above, 6-chloro-2,3-dihydrobenzofuran (142) was prepared starting from 2-bromo-5-chlorophenol. NBS (155 mg, 0.87 mmol) was added to a solution of 2-bromo-5-chloro-2,3-dihydrobenzo[b]furan (142) (135 mg, 0.87 mmol) in 5 ml ACN. The reaction mixture was stirred 5 h at r.t. The yellow solution was poured into ice-water, extracted with EA. Org. phase was washed with aq. sodium bicarbonate and brine subsequently. After dried over sodium sulfate the org. phase was concentrated to give 204 mg (purity>90%, quantitative yield) title compound as pale yellow solid. was prepared extracted with EA phase was washed with aq. sodium bicarbonate and brine subsequently After dried over sodium sulfate the org phase was concentrated

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

Procedure: In a similar way as described above, 6-chloro-2,3-dihydrobenzofuran (142) was prepared starting from 2-bromo-5-chlorophenol. NBS (155 mg, 0.87 mmol) was added to a solution of 2-bromo-5-chloro-2,3-dihydrobenzo[b]furan (142) (135 mg, 0.87 mmol) in 5 ml ACN. The reaction mixture was stirred 5 h at r.t. The yellow solution was poured into ice-water, extracted with EA. Org. phase was washed with aq. sodium bicarbonate and brine subsequently. After dried over sodium sulfate the org. phase was concentrated to give 204 mg (purity>90%, quantitative yield) title compound as pale yellow solid. was prepared extracted with EA phase was washed with aq. sodium bicarbonate and brine subsequently After dried over sodium sulfate the org phase was concentrated

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

Procedure: A suspension of 2-bromo-5-chlorophenol (2.85 g, 13.7 mmol; synthesized in reference to International Patent Publication WO0109122), potassium carbonate (1.89 g, 13.7 mmol), n-Bu4NI (50 mg, 0.137 mmol), methyl iodide (1.28 mL, 20.6 mmol) and N,N-dimethylformamide (8.0 mL) was stirred for two hours. An iced water was added and the obtained mixture was extracted with ethyl acetate twice. The combined organic phase was washed with brine and dried with anhydrous magnesium sulfate. After the desiccant was filtered off, the residue obtained by evaporating the solvent under reduced pressure was purified by silica gel column chromatography (hexane:ethyl acetate=95:5) to obtain colorless oily 2-bromo-5-chloroanisole (2.94 g, 97%). Then, oxalyl chloride (1.23 mL, 15.1 mmol) and N,N-dimethylformamide (2 drops) were added to 4-ethoxybenzoic acid (2.28 g, 13.7 mmol) in chloroform (8 mL) and stirred for five hours. The yellow oil obtained by evaporating the solvent under reduced pressure was dissolved in chloroform (5 mL). To this solution, a chloroform solution (10 mL) of 2-bromo-5-chloroanisole (2.94 g, 13.3 mmol) was added and then aluminum chloride (2.07 g, 15.5 mmol) was added portion wise at −10° C. over five minutes. After stirred at 5° C. for one hour, the reaction mixture was to room temperature and stirred for 13 hours. The reaction mixture was poured into an iced water and extracted with chloroform three times. After washed with 1 M hydrochloric acid, water, brine, the combined organic layer was dried with anhydrous magnesium sulfate. After the desiccant was filtered off, the residue obtained by evaporating the solvent under reduced pressure was purified by NH type silica gel column chromatography (hexane:ethyl acetate=9:1) to obtain (5-bromo-2-chloro-6-methoxyphenyl)(4-ethoxyphenyl)methanone (1.53 g, 31%) as a colorless crystal. the obtained mixture was extracted with ethyl acetate twice The combined organic phase was washed with brine dried with anhydrous magnesium sulfate After the desiccant was filtered off the residue obtained by evaporating the solvent under reduced pressure was purified by silica gel column chromatography (hexane:ethyl acetate=95:5)

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

Procedure: In a similar way as described above, 6-chloro-2,3-dihydrobenzofuran (142) was prepared starting from 2-bromo-5-chlorophenol. NBS (155 mg, 0.87 mmol) was added to a solution of 2-bromo-5-chloro-2,3-dihydrobenzo[b]furan (142) (135 mg, 0.87 mmol) in 5 ml ACN. The reaction mixture was stirred 5 h at r.t. The yellow solution was poured into ice-water, extracted with EA. Org. phase was washed with aq. sodium bicarbonate and brine subsequently. After dried over sodium sulfate the org. phase was concentrated to give 204 mg (purity>90%, quantitative yield) title compound as pale yellow solid. was prepared extracted with EA phase was washed with aq. sodium bicarbonate and brine subsequently After dried over sodium sulfate the org phase was concentrated

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

Procedure: The requisite 4-(4-chloro-2-(R,S)-methylsulfinylphenyl)piperidine was prepared according to the procedures described in Example 2 except 3-chlorophenol was used in place of 3-methoxyphenol. The oxidation of the thiomethyl adduct was carried out according to the procedure described in Example 16, sub-part (e). 3-Chlorophenol (24.28 g) was reacted with bromine (29.78 g) to give 6.15 g of 2-bromo-5-chlorophenol (minor isomer) and 24.60 g 4-bromo-3-chlorophenol (major isomer) after purification by column chromatography (10:1 hexane:EtOAc); minor isomer-1H NMR (CDCl3) δ 7.37 (d, 1H), 7.04 (d, 1H), 6.82 (dd, 1H), 5.55 (s, 1H). Major isomer: 1H NMR (CDCl3) δ 7.36 (d, 1H), 6.91 (d, 1H), 6.57 (dd, 1H), 5.75 (s, 1H). Analytical data for all other intermediates follows. 2-Bromo-5-chloro-(N,N-dimethylthiocarbamoyl)phenol; 1H NMR (CDCl3) δ 7.52 (d, 1H), 7.18 (d, 1H), 7.13 (dd, 1H), 3.47 (s, 3H), 3.39 (s, 3H); MS m/z 296 (M+). 4-Chloro-2-N,N-dimethylthiocarbamoyl)bromobenzene; 1H NMR (CDCl3) δ 7.68-7.55 (m, 2H), 7.23 (dd, 1H), 3.12 (s, 3H), 3.05 (s, 3H); MS m/z 296 (M+). 4-Chloro-2-(thiomethyl)bromobenzene; 1H NMR (CDCl3) δ 7.43 (d, 1H), 7.06 (d, 1H), 6.97 (dd, 1H), 2.48 (s, 3H). 1-Benzyloxycarbonyl-4-hydroxy-4-(4-chloro-2-methylthiophenyl)piperidine; 1H NMR (CDCl3) δ 7.43-7.30 (m, 6H), 7.26 (d, 1H), 7.15 (dd, 1H) 5.15 (s, 2H), 4.25-4.00 (m, 2H), 3.84 (s, 1H), 3.50-3.25 (m, 2H), 2.52 (s, 3H), 2.15-1.90 (m, 4H); MS m/z 414 (M+Na). 1-Benzyloxycarbonyl-4-(4-chloro-2-methylthiophenyl)piperidine; 1H NMR (CDCl3) δ 7.43-7.30 (m, 5H), 7.18-7.10 (m, 3H), 5.16 (s, 2H), 4.42-4.20 (m, 2H), 3.07 (tt, 1H), 3.00-2.80 (m, 2H), 2.47 (s, 3H), 1.91-1.45 (m, 4H); MS m/z 398 (M+Na). 1-Benzyloxycarbonyl-4-(4-chloro-2-(R,S)-methylsulfinylphenyl)piperidine; 1H NMR (CDCl3) δ 7.98 (d, 1H), 7.42 (dd, 1H), 7.41-7.30 (m, 5H), 7.21 (d, 1H), 5.16 (s, 2H), 4.43-4.21 (m, 2H), 2.96-2.78 (m, 3H), 2.71 (s, 3H), 1.92-1.51 (m, 4H). 4-(4-Chloro-2-(R,S)-methylsulfinylphenyl)piperidine; 1H NMR (CDCl3) δ 7.97 (d, 1H), 7.43 (dd, 1H), 7.28 (d, 1H), 3.30-3.10 (m, 2H), 2.71 (s, 3H), 2.83-2.61 (m, 3H), 1.92-1.51 (m, 5H); MS m/z 258 (M+H).

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

Procedure: A suspension of 2-bromo-5-chlorophenol (2.85 g, 13.7 mmol; synthesized in reference to International Patent Publication WO0109122), potassium carbonate (1.89 g, 13.7 mmol), n-Bu4NI (50 mg, 0.137 mmol), methyl iodide (1.28 mL, 20.6 mmol) and N,N-dimethylformamide (8.0 mL) was stirred for two hours. An iced water was added and the obtained mixture was extracted with ethyl acetate twice. The combined organic phase was washed with brine and dried with anhydrous magnesium sulfate. After the desiccant was filtered off, the residue obtained by evaporating the solvent under reduced pressure was purified by silica gel column chromatography (hexane:ethyl acetate=95:5) to obtain colorless oily 2-bromo-5-chloroanisole (2.94 g, 97%). Then, oxalyl chloride (1.23 mL, 15.1 mmol) and N,N-dimethylformamide (2 drops) were added to 4-ethoxybenzoic acid (2.28 g, 13.7 mmol) in chloroform (8 mL) and stirred for five hours. The yellow oil obtained by evaporating the solvent under reduced pressure was dissolved in chloroform (5 mL). To this solution, a chloroform solution (10 mL) of 2-bromo-5-chloroanisole (2.94 g, 13.3 mmol) was added and then aluminum chloride (2.07 g, 15.5 mmol) was added portion wise at −10° C. over five minutes. After stirred at 5° C. for one hour, the reaction mixture was to room temperature and stirred for 13 hours. The reaction mixture was poured into an iced water and extracted with chloroform three times. After washed with 1 M hydrochloric acid, water, brine, the combined organic layer was dried with anhydrous magnesium sulfate. After the desiccant was filtered off, the residue obtained by evaporating the solvent under reduced pressure was purified by NH type silica gel column chromatography (hexane:ethyl acetate=9:1) to obtain (5-bromo-2-chloro-6-methoxyphenyl)(4-ethoxyphenyl)methanone (1.53 g, 31%) as a colorless crystal. the obtained mixture was extracted with ethyl acetate twice The combined organic phase was washed with brine dried with anhydrous magnesium sulfate After the desiccant was filtered off the residue obtained by evaporating the solvent under reduced pressure was purified by silica gel column chromatography (hexane:ethyl acetate=95:5)

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

Procedure: A suspension of 2-bromo-5-chlorophenol (2.85 g, 13.7 mmol; synthesized in reference to International Patent Publication WO0109122), potassium carbonate (1.89 g, 13.7 mmol), n-Bu4NI (50 mg, 0.137 mmol), methyl iodide (1.28 mL, 20.6 mmol) and N,N-dimethylformamide (8.0 mL) was stirred for two hours. An iced water was added and the obtained mixture was extracted with ethyl acetate twice. The combined organic phase was washed with brine and dried with anhydrous magnesium sulfate. After the desiccant was filtered off, the residue obtained by evaporating the solvent under reduced pressure was purified by silica gel column chromatography (hexane:ethyl acetate=95:5) to obtain colorless oily 2-bromo-5-chloroanisole (2.94 g, 97%). Then, oxalyl chloride (1.23 mL, 15.1 mmol) and N,N-dimethylformamide (2 drops) were added to 4-ethoxybenzoic acid (2.28 g, 13.7 mmol) in chloroform (8 mL) and stirred for five hours. The yellow oil obtained by evaporating the solvent under reduced pressure was dissolved in chloroform (5 mL). To this solution, a chloroform solution (10 mL) of 2-bromo-5-chloroanisole (2.94 g, 13.3 mmol) was added and then aluminum chloride (2.07 g, 15.5 mmol) was added portion wise at −10° C. over five minutes. After stirred at 5° C. for one hour, the reaction mixture was to room temperature and stirred for 13 hours. The reaction mixture was poured into an iced water and extracted with chloroform three times. After washed with 1 M hydrochloric acid, water, brine, the combined organic layer was dried with anhydrous magnesium sulfate. After the desiccant was filtered off, the residue obtained by evaporating the solvent under reduced pressure was purified by NH type silica gel column chromatography (hexane:ethyl acetate=9:1) to obtain (5-bromo-2-chloro-6-methoxyphenyl)(4-ethoxyphenyl)methanone (1.53 g, 31%) as a colorless crystal. the obtained mixture was extracted with ethyl acetate twice The combined organic phase was washed with brine dried with anhydrous magnesium sulfate After the desiccant was filtered off the residue obtained by evaporating the solvent under reduced pressure was purified by silica gel column chromatography (hexane:ethyl acetate=95:5)