[4,5-difluoro-2-(hydroxymethyl)phenyl]methanol

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

Procedure: To a solution of oxalyl chloride 2M in dichloromethane (DCM) (4.5 ml, 8.8 mmol, 2.2 molar equivalents) cooled to −78° C. was added dropwise a solution of dimethylsulfoxyde (DMSO) (1.25 ml, 17.7 mmol, 4.4 molar equivalents) in DCM (5 ml). The solution was stirred at −78° C. for 5 minutes and 4,5-difluorobenzene-1,2-dimethanol (compound 21) (0.70 g, 4.0 mmol, 1.0 molar equivalent) dissolved in a mixture of DCM/DMSO (1-2 ml) was added dropwise. The solution was stirred for 1 hour at −78° C. and triethylamine (15 ml) was slowly added at −78° C. The reaction mixture was stirred for 10 minutes at −78° C. and slowly warmed up to room temperature. Ice-cold water (25 ml) was added to the reaction mixture and the aqueous layer extracted with DCM (3 times 30 ml). The organic fractions were combined, dried over magnesium sulfate, filtered and concentrated in vacuum to give a yellow oil. Purification by column chromatography on silica gel (eluent, hexane:DCM 2:8) gave the title compound as a light yellow solid (0.58 g, 85%). 1H NMR (300.13 MHz, CDCl3) δ(ppm) 7.83 (t, J=9.00 Hz, 2H) 10.49 (s, 2H). 19F NMR (282.38 MHz, CDCl3) δ(ppm) −127.10 (s). was added dropwise The solution was stirred for 1 hour at −78° C. The reaction mixture was stirred for 10 minutes at −78° C. slowly warmed up to room temperature the aqueous layer extracted with DCM (3 times 30 ml) dried over magnesium sulfate filtered concentrated in vacuum to give a yellow oil Purification by column chromatography on silica gel (eluent, hexane:DCM 2:8)

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

Procedure: To a solution of LiAlH4 (1M in tetrahydrofuran) (11 ml, 11.0 mmol, 2.0 molar equivalents) cooled to −78° C. was added dropwise a solution of 4,5-difluorophtalic anhydrid (1.0 g, 5.4 mmol, 1 molar equivalent) in THF (5 ml). The reaction mixture was allowed to warm up to room temperature and then stirred at 70° C. for 2 hours. To this resulting solution cooled to 0° C. was added a 2M sodium hydroxide solution (5 ml) followed by cold water (5 ml) and THF (10 ml). The reaction mixture was then further extracted with THF (3 times 20 ml). The organic fractions were combined, washed with brine, dried over magnesium sulfate, filtered and concentrated in vacuum to give a light yellow solid. Purification by recrystallisation from acetone/hexane gave the title compound as light yellow needles (0.8 g, 85%). 1H NMR (300.13 MHz, DMSO) δ(ppm) 4.47 (d, J=5.30, 4H) 5.26 (t, J=5.30 Hz, 2H) 7.36 (t, J=10.10 Hz, 2H). 19F NMR (282.38 MHz, DMSO) δ(ppm) −142.27 (s). To this resulting solution cooled to 0° C. The reaction mixture was then further extracted with THF (3 times 20 ml) washed with brine dried over magnesium sulfate filtered concentrated in vacuum to give a light yellow solid Purification by recrystallisation from acetone/hexane

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

Procedure: To a solution of oxalyl chloride 2M in dichloromethane (DCM) (4.5 ml, 8.8 mmol, 2.2 molar equivalents) cooled to −78° C. was added dropwise a solution of dimethylsulfoxyde (DMSO) (1.25 ml, 17.7 mmol, 4.4 molar equivalents) in DCM (5 ml). The solution was stirred at −78° C. for 5 minutes and 4,5-difluorobenzene-1,2-dimethanol (compound 21) (0.70 g, 4.0 mmol, 1.0 molar equivalent) dissolved in a mixture of DCM/DMSO (1-2 ml) was added dropwise. The solution was stirred for 1 hour at −78° C. and triethylamine (15 ml) was slowly added at −78° C. The reaction mixture was stirred for 10 minutes at −78° C. and slowly warmed up to room temperature. Ice-cold water (25 ml) was added to the reaction mixture and the aqueous layer extracted with DCM (3 times 30 ml). The organic fractions were combined, dried over magnesium sulfate, filtered and concentrated in vacuum to give a yellow oil. Purification by column chromatography on silica gel (eluent, hexane:DCM 2:8) gave the title compound as a light yellow solid (0.58 g, 85%). 1H NMR (300.13 MHz, CDCl3) δ(ppm) 7.83 (t, J=9.00 Hz, 2H) 10.49 (s, 2H). 19F NMR (282.38 MHz, CDCl3) δ(ppm) −127.10 (s). was added dropwise The solution was stirred for 1 hour at −78° C. The reaction mixture was stirred for 10 minutes at −78° C. slowly warmed up to room temperature the aqueous layer extracted with DCM (3 times 30 ml) dried over magnesium sulfate filtered concentrated in vacuum to give a yellow oil Purification by column chromatography on silica gel (eluent, hexane:DCM 2:8)

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

Procedure: To a solution of LiAlH4 (1M in tetrahydrofuran) (11 ml, 11.0 mmol, 2.0 molar equivalents) cooled to −78° C. was added dropwise a solution of 4,5-difluorophtalic anhydride (1.0 g, 5.4 mmol, 1 molar equivalent) in THF (5 ml). The reaction mixture was allowed to warm up to room temperature and then stirred at 70° C. for 2 hours. To this resulting solution cooled to 0° C. was added a 2M sodium hydroxide solution (5 ml) followed by cold water (5 ml) and THF (10 ml). The reaction mixture was then further extracted with THF (3 times 20 ml). The organic fractions were combined, washed with brine, dried over magnesium sulfate, filtered and concentrated in vacuum to give a light yellow solid. Purification by recrystallisation from acetone/hexane gave the title compound as light yellow needles (0.8 g, 85%). 1H NMR (300.13 MHz, DMSO) δ(ppm) 4.47 (d, J=5.30, 4H) 5.26 (t, J=5.30 Hz, 2H) 7.36 (t, J=10.10 Hz, 2H). 19F NMR (282.38 MHz, DMSO) δ(ppm) −142.27 (s). To this resulting solution cooled to 0° C. The reaction mixture was then further extracted with THF (3 times 20 ml) washed with brine dried over magnesium sulfate filtered concentrated in vacuum to give a light yellow solid Purification by recrystallisation from acetone/hexane

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

Procedure: To a solution of oxalyl chloride 2M in dichloromethane (DCM) (4.5 ml, 8.8 mmol, 2.2 molar equivalents) cooled to −78° C. was added dropwise a solution of dimethylsulfoxyde (DMSO) (1.25 ml, 17.7 mmol, 4.4 molar equivalents) in DCM (5 ml). The solution was stirred at −78° C. for 5 minutes and 4,5-difluorobenzene-1,2-dimethanol (compound 21) (0.70 g, 4.0 mmol, 1.0 molar equivalent) dissolved in a mixture of DCM/DMSO (1-2 ml) was added dropwise. The solution was stirred for 1 hour at −78° C. and triethylamine (15 ml) was slowly added at −78° C. The reaction mixture was stirred for 10 minutes at −78° C. and slowly warmed up to room temperature. Ice-cold water (25 ml) was added to the reaction mixture and the aqueous layer extracted with DCM (3 times 30 ml). The organic fractions were combined, dried over magnesium sulfate, filtered and concentrated in vacuum to give a yellow oil. Purification by column chromatography on silica gel (eluent, hexane:DCM 2:8) gave the title compound as a light yellow solid (0.58 g, 85%). 1H NMR (300.13 MHz, CDCl3) δ(ppm) 7.83 (t, J=9.00 Hz, 2H) 10.49 (s, 2H). 19F NMR (282.38 MHz, CDCl3) δ(ppm) −127.10 (s). was added dropwise The solution was stirred for 1 hour at −78° C. The reaction mixture was stirred for 10 minutes at −78° C. slowly warmed up to room temperature the aqueous layer extracted with DCM (3 times 30 ml) dried over magnesium sulfate filtered concentrated in vacuum to give a yellow oil Purification by column chromatography on silica gel (eluent, hexane:DCM 2:8)

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

Procedure: To a solution of LiAlH4 (1M in tetrahydrofuran) (11 ml, 11.0 mmol, 2.0 molar equivalents) cooled to −78° C. was added dropwise a solution of 4,5-difluorophtalic anhydrid (1.0 g, 5.4 mmol, 1 molar equivalent) in THF (5 ml). The reaction mixture was allowed to warm up to room temperature and then stirred at 70° C. for 2 hours. To this resulting solution cooled to 0° C. was added a 2M sodium hydroxide solution (5 ml) followed by cold water (5 ml) and THF (10 ml). The reaction mixture was then further extracted with THF (3 times 20 ml). The organic fractions were combined, washed with brine, dried over magnesium sulfate, filtered and concentrated in vacuum to give a light yellow solid. Purification by recrystallisation from acetone/hexane gave the title compound as light yellow needles (0.8 g, 85%). 1H NMR (300.13 MHz, DMSO) δ(ppm) 4.47 (d, J=5.30, 4H) 5.26 (t, J=5.30 Hz, 2H) 7.36 (t, J=10.10 Hz, 2H). 19F NMR (282.38 MHz, DMSO) δ(ppm) −142.27 (s). To this resulting solution cooled to 0° C. The reaction mixture was then further extracted with THF (3 times 20 ml) washed with brine dried over magnesium sulfate filtered concentrated in vacuum to give a light yellow solid Purification by recrystallisation from acetone/hexane

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

Procedure: To a solution of oxalyl chloride 2M in dichloromethane (DCM) (4.5 ml, 8.8 mmol, 2.2 molar equivalents) cooled to −78° C. was added dropwise a solution of dimethylsulfoxyde (DMSO) (1.25 ml, 17.7 mmol, 4.4 molar equivalents) in DCM (5 ml). The solution was stirred at −78° C. for 5 minutes and 4,5-difluorobenzene-1,2-dimethanol (compound 21) (0.70 g, 4.0 mmol, 1.0 molar equivalent) dissolved in a mixture of DCM/DMSO (1-2 ml) was added dropwise. The solution was stirred for 1 hour at −78° C. and triethylamine (15 ml) was slowly added at −78° C. The reaction mixture was stirred for 10 minutes at −78° C. and slowly warmed up to room temperature. Ice-cold water (25 ml) was added to the reaction mixture and the aqueous layer extracted with DCM (3 times 30 ml). The organic fractions were combined, dried over magnesium sulfate, filtered and concentrated in vacuum to give a yellow oil. Purification by column chromatography on silica gel (eluent, hexane:DCM 2:8) gave the title compound as a light yellow solid (0.58 g, 85%). 1H NMR (300.13 MHz, CDCl3) δ(ppm) 7.83 (t, J=9.00 Hz, 2H) 10.49 (s, 2H). 19F NMR (282.38 MHz, CDCl3) δ(ppm) −127.10 (s). was added dropwise The solution was stirred for 1 hour at −78° C. The reaction mixture was stirred for 10 minutes at −78° C. slowly warmed up to room temperature the aqueous layer extracted with DCM (3 times 30 ml) dried over magnesium sulfate filtered concentrated in vacuum to give a yellow oil Purification by column chromatography on silica gel (eluent, hexane:DCM 2:8)

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

Procedure: To a solution of LiAlH4 (1M in tetrahydrofuran) (11 ml, 11.0 mmol, 2.0 molar equivalents) cooled to −78° C. was added dropwise a solution of 4,5-difluorophtalic anhydrid (1.0 g, 5.4 mmol, 1 molar equivalent) in THF (5 ml). The reaction mixture was allowed to warm up to room temperature and then stirred at 70° C. for 2 hours. To this resulting solution cooled to 0° C. was added a 2M sodium hydroxide solution (5 ml) followed by cold water (5 ml) and THF (10 ml). The reaction mixture was then further extracted with THF (3 times 20 ml). The organic fractions were combined, washed with brine, dried over magnesium sulfate, filtered and concentrated in vacuum to give a light yellow solid. Purification by recrystallisation from acetone/hexane gave the title compound as light yellow needles (0.8 g, 85%). 1H NMR (300.13 MHz, DMSO) δ(ppm) 4.47 (d, J=5.30, 4H) 5.26 (t, J=5.30 Hz, 2H) 7.36 (t, J=10.10 Hz, 2H). 19F NMR (282.38 MHz, DMSO) δ(ppm) −142.27 (s). To this resulting solution cooled to 0° C. The reaction mixture was then further extracted with THF (3 times 20 ml) washed with brine dried over magnesium sulfate filtered concentrated in vacuum to give a light yellow solid Purification by recrystallisation from acetone/hexane