5-(bromomethyl)-1,3-difluoro-2-methylsulfanylbenzene

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

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of phenyl[(trimethylsilyl)-oxy]aceto-nitrile (13.7 g, 60.7 mmol) in anhydrous THF (140 mL) cooled in a dry ice/acetone bath, was added a THF solution of lithium bis(trimethylsilyl)amide (62 mL 1.0M) slowly over 15 minutes. The reaction mixture was stirred for 45 minutes cooling at −78° C., then a solution of 5-(bromomethyl)-1,3-difluoro-2-(methylthio)benzene (14.7 g, 58 mmol) in anhydrous THF (20 mL) was added over 10 minutes. The reaction mixture was allowed to warm to room temperature, and stirred for 18 hours. To this mixture was added 5% HCl (300 mL) and the mixture stirred for one hour. The resulting oil was extracted with ethyl acetate (1×400 mL, 2×100 mL). To the combined extracts was added 5% sodium hydroxide (200 mL), and the mixture stirred for one hour. Additional water (200 mL) was added, the organic phase was separated, and the aqueous phase extracted with ethyl acetate (2×150 mL). The combined extracts were dried using magnesium sulfate, and concentrated. Chromatography on silica gel with 15% dichloromethane in hexanes initially and eluting the product with 30% gave 2-[3,5-difluoro-4-(methylthio)phenyl]-1-phenylethanone as light yellow solid (11.0 g, 68%). MP 71.8-71.9° C. 1H NMR (CDCl3/400 MHz) 7.96-7.99 (m, 2H), 7.57-7.61 (m, 1H), 7.24-7.50 (m, 2H), 6.80-6.85 (m, 2H), 4.24 (s, 2H), 2.42 (s, 3H). HRMS m/z 279.0667 (M+H+, calcd 279.0655). Anal. Calcd for C15H12F2OS: C, 64.73; H, 4.35. Found: C, 64.70; H, 4.38. to warm to room temperature stirred for 18 hours the mixture stirred for one hour The resulting oil was extracted with ethyl acetate (1×400 mL, 2×100 mL) To the combined extracts was added 5% sodium hydroxide (200 mL) the mixture stirred for one hour Additional water (200 mL) was added the organic phase was separated the aqueous phase extracted with ethyl acetate (2×150 mL) The combined extracts were dried concentrated Chromatography on silica gel with 15% dichloromethane in hexanes initially and eluting the product with 30%

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

Procedure: A mixture of 5-(chloromethyl)-1,3-difluoro-2-(methylthio)benzene (21.3 g, 0.10 mol), lithium bromide (15 g, 0.17 mol), and acetone (200 mL) was heated and held at reflux for 18 hours. The cool mixture was poured into water and extracted with dichloromethane (1×200 mL, 2×50 mL). The combined extracts were dried using magnesium sulfate, and concentrated. The residue was dissolved in acetone (200 mL), lithium bromide (30 g, 0.34 mol) and sodium bromide (20 g, 0.19 mol) were added and the mixture heated and held at reflux for 42 hours. The mixture was cooled, added to water, and extracted with dichloromethane (1×150 mL, 1×50 mL). The combined extracts were washed with dilute sodium chloride, dried with magnesium sulfate, and concentrated. The 5-(bromomethyl)-1,3-difluoro-2-(methylthio)benzene was purified using silica gel chromatography using hexanes as a yellow solid (20.5 g, 80%). 1H NMR (CDCl3/400 MHz) 6.92-6.95 (m, 2H), 4.37 (s, 2H), 2.45 (s, 3H). HRMS m/z 251.9432 (M+, calcd 251.9420). was heated at reflux for 18 hours extracted with dichloromethane (1×200 mL, 2×50 mL) The combined extracts were dried concentrated The residue was dissolved in acetone (200 mL) the mixture heated at reflux for 42 hours The mixture was cooled extracted with dichloromethane (1×150 mL, 1×50 mL) The combined extracts were washed with dilute sodium chloride dried with magnesium sulfate concentrated The 5-(bromomethyl)-1,3-difluoro-2-(methylthio)benzene was purified

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

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of phenyl[(trimethylsilyl)-oxy]aceto-nitrile (13.7 g, 60.7 mmol) in anhydrous THF (140 mL) cooled in a dry ice/acetone bath, was added a THF solution of lithium bis(trimethylsilyl)amide (62 mL 1.0M) slowly over 15 minutes. The reaction mixture was stirred for 45 minutes cooling at −78° C., then a solution of 5-(bromomethyl)-1,3-difluoro-2-(methylthio)benzene (14.7 g, 58 mmol) in anhydrous THF (20 mL) was added over 10 minutes. The reaction mixture was allowed to warm to room temperature, and stirred for 18 hours. To this mixture was added 5% HCl (300 mL) and the mixture stirred for one hour. The resulting oil was extracted with ethyl acetate (1×400 mL, 2×100 mL). To the combined extracts was added 5% sodium hydroxide (200 mL), and the mixture stirred for one hour. Additional water (200 mL) was added, the organic phase was separated, and the aqueous phase extracted with ethyl acetate (2×150 mL). The combined extracts were dried using magnesium sulfate, and concentrated. Chromatography on silica gel with 15% dichloromethane in hexanes initially and eluting the product with 30% gave 2-[3,5-difluoro-4-(methylthio)phenyl]-1-phenylethanone as light yellow solid (11.0 g, 68%). MP 71.8-71.9° C. 1H NMR (CDCl3/400 MHz) 7.96-7.99 (m, 2H), 7.57-7.61 (m, 1H), 7.24-7.50 (m, 2H), 6.80-6.85 (m, 2H), 4.24 (s, 2H), 2.42 (s, 3H). HRMS m/z 279.0667 (M+H+, calcd 279.0655). Anal. Calcd for C15H12F2OS: C, 64.73; H, 4.35. Found: C, 64.70; H, 4.38. to warm to room temperature stirred for 18 hours the mixture stirred for one hour The resulting oil was extracted with ethyl acetate (1×400 mL, 2×100 mL) To the combined extracts was added 5% sodium hydroxide (200 mL) the mixture stirred for one hour Additional water (200 mL) was added the organic phase was separated the aqueous phase extracted with ethyl acetate (2×150 mL) The combined extracts were dried concentrated Chromatography on silica gel with 15% dichloromethane in hexanes initially and eluting the product with 30%

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

Procedure: A mixture of 5-(chloromethyl)-1,3-difluoro-2-(methylthio)benzene (21.3 g, 0.10 mol), lithium bromide (15 g, 0.17 mol), and acetone (200 mL) was heated and held at reflux for 18 hours. The cool mixture was poured into water and extracted with dichloromethane (1×200 mL, 2×50 mL). The combined extracts were dried using magnesium sulfate, and concentrated. The residue was dissolved in acetone (200 mL), lithium bromide (30 g, 0.34 mol) and sodium bromide (20 g, 0.19 mol) were added and the mixture heated and held at reflux for 42 hours. The mixture was cooled, added to water, and extracted with dichloromethane (1×150 mL, 1×50 mL). The combined extracts were washed with dilute sodium chloride, dried with magnesium sulfate, and concentrated. The 5-(bromomethyl)-1,3-difluoro-2-(methylthio)benzene was purified using silica gel chromatography using hexanes as a yellow solid (20.5 g, 80%). 1H NMR (CDCl3/400 MHz) 6.92-6.95 (m, 2H), 4.37 (s, 2H), 2.45 (s, 3H). HRMS m/z 251.9432 (M+, calcd 251.9420). was heated at reflux for 18 hours extracted with dichloromethane (1×200 mL, 2×50 mL) The combined extracts were dried concentrated The residue was dissolved in acetone (200 mL) the mixture heated at reflux for 42 hours The mixture was cooled extracted with dichloromethane (1×150 mL, 1×50 mL) The combined extracts were washed with dilute sodium chloride dried with magnesium sulfate concentrated The 5-(bromomethyl)-1,3-difluoro-2-(methylthio)benzene was purified

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of phenyl[(trimethylsilyl)-oxy]aceto-nitrile (13.7 g, 60.7 mmol) in anhydrous THF (140 mL) cooled in a dry ice/acetone bath, was added a ThF solution of lithium bis(trimethylsilyl)amide(62 mL 1.0 M) slowly over 15 minutes. The reaction mixture was stirred for 45 minutes cooling at −78° C., then a solution of 5-(bromomethyl)-1,3-difluoro-2-(methylthio)benzene (14.7 g, 58 mmol) in anhydrous THF (20 mL) was added over 10 minutes. The reaction mixture was allowed to warm to room temperature, and stirred for 18 hours. To this mixture was added 5% HCl (300 mL) and the mixture stirred for one hour. The resulting oil was extracted with ethyl acetate (1×400 mL, 2×100 mL). To the combined extracts was added 5% sodium hydroxide (200 mL), and the mixture stirred for one hour. Additional water (200 mL) was added, the organic phase was separated, and the aqueous phase extracted with ethyl acetate (2×150 mL). The combined extracts were dried using magnesium sulfate, and concentrated. Chromatography on silica gel with 15% dichloromethane in hexanes initially and eluting the product with 30% gave 2-[3,5-difluoro-4-(methylthio)phenyl]-1-phenylethanone as light yelow solid (11.0 g, 68%). MP 71.8-71.9° C. 1H NMR (CDCl3/400 MHz) 7.96-7.99 (m, 2H), 7.57-7.61 (m, 1H), 7.24-7.50 (m, 2H), 6.80-6.85 (m, 2H), 4.24 (s, 2H), 2.42 (s, 3H). HRMS m/z 279.0667 (M+H+, calcd 279.0655). Anal. Calcd for C15H12F2OS: C, 64.73; H, 4.35; Found: C, 64.70; H, 4.38. to warm to room temperature stirred for 18 hours the mixture stirred for one hour The resulting oil was extracted with ethyl acetate (1×400 mL, 2×100 mL) To the combined extracts was added 5% sodium hydroxide (200 mL) the mixture stirred for one hour Additional water (200 mL) was added the organic phase was separated the aqueous phase extracted with ethyl acetate (2×150 mL) The combined extracts were dried concentrated Chromatography on silica gel with 15% dichloromethane in hexanes initially and eluting the product with 30%

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

Procedure: A mixture of 5-(chloromethyl)-1,3-difluoro-2-(methylthio)benzene (21.3 g, 0.10 mol), lithium bromide (15 g, 0.17 mol), and acetone (200 mL) was heated and held at reflux for 18 hours. The cool mixture was poured into water and extracted with dichloromethane (1×200 mL, 2×50 mL). The combined extracts were dried using magnesium sulfate, and concentrated. The residue was dissolved in acetone (200 mL), lithium bromide (30 g, 0.34 mol) and sodium bromide (20 g, 0.19 mol) were added and the mixture heated and held at 5 reflux for 42 hours. The mixture was cooled, added to water, and extracted with dichloromethane (1×150 mL, 1×50 mL). The combined extracts were washed with dilute sodium chloride, dried with magnesium sulfate, and concentrated. The 5-(bromomethyl)-1,3-difluoro-2-(methylthio)benzene was purified using silica gel chromatography using hexanes as a yellow solid (20.5 g, 80%). 1H NMR (CDCl3/400 MHz) 6.92-6.95 (m, 2H), 4.37 (s, 2H), 2.45 (s, 3H). HRMS m/z 251.9432 (M+, calcd 251.9420). was heated at reflux for 18 hours extracted with dichloromethane (1×200 mL, 2×50 mL) The combined extracts were dried concentrated The residue was dissolved in acetone (200 mL) the mixture heated reflux for 42 hours The mixture was cooled extracted with dichloromethane (1×150 mL, 1×50 mL) The combined extracts were washed with dilute sodium chloride dried with magnesium sulfate concentrated The 5-(bromomethyl)-1,3-difluoro-2-(methylthio)benzene was purified

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

Procedure: The product from step B was converted to the bromide according to the procedure from intermediate 5 (step A). 1H NMR (500 MHz, CDCl3) δ 7.36 (d, J 7.5 Hz, 2H), 4.82 (s, 2H), 2.88 (s, 3H)

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of phenyl[(trimethylsilyl)-oxy]aceto-nitrile (13.7 g, 60.7 mmol) in anhydrous THF (140 mL) cooled in a dry ice/acetone bath, was added a THF solution of lithium bis(trimethylsilyl)amide (62 mL 1.0M) slowly over 15 minutes. The reaction mixture was stirred for 45 minutes cooling at −78° C., then a solution of 5-(bromomethyl)-1,3-difluoro-2-(methylthio)benzene (14.7 g, 58 mmol) in anhydrous THF (20 mL) was added over 10 minutes. The reaction mixture was allowed to warm to room temperature, and stirred for 18 hours. To this mixture was added 5% HCl (300 mL) and the mixture stirred for one hour. The resulting oil was extracted with ethyl acetate (1×400 mL, 2×100 mL). To the combined extracts was added 5% sodium hydroxide (200 mL), and the mixture stirred for one hour. Additional water (200 mL) was added, the organic phase was separated, and the aqueous phase extracted with ethyl acetate (2×150 mL). The combined extracts were dried using magnesium sulfate, and concentrated. Chromatography on silica gel with 15% dichloromethane in hexanes initially and eluting the product with 30% gave 2-[3,5-difluoro-4-(methylthio)phenyl]-1-phenylethanone as light yellow solid (11.0 g, 68%). MP 71.8-71.9° C. 1H NMR (CDCl3/400 MHz) 7.96-7.99 (m, 2H), 7.57-7.61 (m, 1H), 7.24-7.50 (m, 2H), 6.80-6.85 (m, 2H), 4.24 (s, 2H), 2.42 (s, 3H). HRMS m/z 279.0667 (M+H+, calcd 279.0655). Anal. Calcd for C15H12F2OS: C, 64.73; H, 4.35. Found: C, 64.70; H, 4.38. to warm to room temperature stirred for 18 hours the mixture stirred for one hour The resulting oil was extracted with ethyl acetate (1×400 mL, 2×100 mL) To the combined extracts was added 5% sodium hydroxide (200 mL) the mixture stirred for one hour Additional water (200 mL) was added the organic phase was separated the aqueous phase extracted with ethyl acetate (2×150 mL) The combined extracts were dried concentrated Chromatography on silica gel with 15% dichloromethane in hexanes initially and eluting the product with 30%

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

Procedure: A mixture of 5-(chloromethyl)-1,3-difluoro-2-(methylthio)benzene (21.3 g, 0.10 mol), lithium bromide (15 g, 0.17 mol), and acetone (200 mL) was heated and held at reflux for 18 hours. The cool mixture was poured into water and extracted with dichloromethane (1×200 mL, 2×50 mL). The combined extracts were dried using magnesium sulfate, and concentrated. The residue was dissolved in acetone (200 mL), lithium bromide (30 g, 0.34 mol) and sodium bromide (20 g, 0.19 mol) were added and the mixture heated and held at reflux for 42 hours. The mixture was cooled, added to water, and extracted with dichloromethane (1×150 mL, 1×50 mL). The combined extracts were washed with dilute sodium chloride, dried with magnesium sulfate, and concentrated. The 5-(bromomethyl)-1,3-difluoro-2-(methylthio)benzene was purified using silica gel chromatography using hexanes as a yellow solid (20.5 g, 80%). 1H NMR (CDCl3/400 MHz) 6.92-6.95 (m, 2H), 4.37 (s, 2H), 2.45 (s, 3H). HRMS m/z 251.9432 (M+, calcd 251.9420). was heated at reflux for 18 hours extracted with dichloromethane (1×200 mL, 2×50 mL) The combined extracts were dried concentrated The residue was dissolved in acetone (200 mL) the mixture heated at reflux for 42 hours The mixture was cooled extracted with dichloromethane (1×150 mL, 1×50 mL) The combined extracts were washed with dilute sodium chloride dried with magnesium sulfate concentrated The 5-(bromomethyl)-1,3-difluoro-2-(methylthio)benzene was purified