1,3-difluoro-5-methylbenzene

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

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

Conditions: temp:-50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 1,3-difluoro-5-methylbenzene (10.2 g, 80 mmol) in anhydrous ether (80 mL) was added n-BuLi (2.5 M solution in hexane, 48 ml, 120 mmol) over a 20 min period while the internal temperature was maintained at around −50° C. After stirring at that temperature for 1.5 hr, DMF (14.6 g, 200 mmol) was added over a 20 min period. After stirring at the same temperature for an additional 1.5 h, the reaction mixture was slowly poured into 1N aqueous sulfuric acid (300 mL) and extracted with ether three times. The combined organic layers were washed with brine, dried over anhydrous MgSO4, filtered and concentrated to give the title compound (11.2 g, 90%). 1H-NMR (500 MHz, CDCl3): δ 10.25 (s, 1H), 6.75 (d, 2H, J=9.9 Hz), 2.39 (s, 3H). After stirring at the same temperature for an additional 1.5 h extracted with ether three times The combined organic layers were washed with brine dried over anhydrous MgSO4 filtered concentrated

Conditions: temp:-50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 1,3-difluoro-5-methylbenzene (10.2 g, 80 mmol) in anhydrous ether (80 mL) was added n-BuLi (2.5 M solution in hexane, 48 ml, 120 mmol) over a 20 min period while the internal temperature was maintained at around −50° C. After stirring at that temperature for 1.5 hr, DMF (14.6 g, 200 mmol) was added over a 20 min period. After stirring at the same temperature for an additional 1.5 h, the reaction mixture was slowly poured into 1N aqueous sulfuric acid (300 mL) and extracted with ether three times. The combined organic layers were washed with brine, dried over anhydrous MgSO4, filtered and concentrated to give the title compound (11.2 g, 90%). 1H-NMR (500 MHz, CDCl3): δ 10.25 (s, 1H), 6.75 (d, 2H, J=9.9 Hz), 2.39 (s, 3H). After stirring at the same temperature for an additional 1.5 h extracted with ether three times The combined organic layers were washed with brine dried over anhydrous MgSO4 filtered concentrated

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

Procedure: A mixture of 1-(bromomethyl)-3,5-difluorobenzene (50 g, 0.24 mol), 10% Pd/C (3 g) and sodium acetate (140 g, 1.7 mol) in anhydrous ether (250 mL) was stirred under hydrogen at atmospheric pressure for 24 hr. The mixture was filtered and the filtrate was dried over anhydrous Na2SO4, filtered and used directly in the next step. 1H-NMR (500 MHz, CDCl3): δ 6.56 (d, 2H, J=6.0 Hz), 6.47 (t, 1H, J=9.0 Hz), 2.22 (s, 3H). The mixture was filtered the filtrate was dried over anhydrous Na2SO4 filtered

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

Procedure: The title compound was prepared from 1-bromomethyl-2,3,5-trifluoro-benzene by a procedure analogous to that for 3,5-difluorotoluene, above. 1H NMR (400 MHz, CDCl3) δppm; MS (APCl, m/z): [M+H]+.

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

Procedure: A mixture of 1-bromomethyl-3,5-difluoro-benzene (75 g, 0.362 mol), Pd/C (5%, 5 g), and sodium acetate (208 g, 2.54 mol) in ether (300 mL) was treated with hydrogen gas (50 psi) in a Parr shaker for 2 days. The mixture was filtered through Celite and the organic solution washed three times with saturated aqueous sodium bicarbonate solution. The aqueous layers were washed with ether and the combined organic layers dried (MgSO4), filtered, and partially concentrated by evaporation using a cold water bath. The volatile product was obtained as a mixture with ether and the ratio (˜3:2, ether:product, g:g) calculated based on 1H NMR integration to determine actual yield (45.5 g, 0.355 mol, 98%) of product for scaling reagents in the ensuing reaction. 1H NMR (400 MHz, CDCl3) δ 2.25 (s, 3H), 6.51-6.56 (m, 1H), 6.58-6.60 (m, 2H) ppm. The mixture was filtered through Celite the organic solution washed three times with saturated aqueous sodium bicarbonate solution The aqueous layers were washed with ether the combined organic layers dried (MgSO4) filtered partially concentrated by evaporation The volatile product was obtained as a mixture with ether

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

Procedure: A mixture of 1-bromomethyl-3,5-difluoro-benzene (75 g, 0.362 mol), Pd/C (5%, 5 g), and sodium acetate (208 g, 2.54 mol) in ether (300 mL) was treated with hydrogen gas (50 psi) in a Parr shaker for 2 days. The mixture was filtered through Celite and the organic solution washed three times with saturated aqueous sodium bicarbonate solution. The aqueous layers were washed with ether and the combined organic layers dried (MgSO4), filtered, and partially concentrated by evaporation using a cold water bath. The volatile product was obtained as a mixture with ether and the ratio (˜3:2, ether:product, g:g) calculated based on 1H NMR integration to determine actual yield (45.5 g, 0.355 mol, 98%) of product for scaling reagents in the ensuing reaction. 1H NMR (400 MHz, CDCl3) δ 2.25 (s, 3H), 6.51-6.56 (m, 1H), 6.58-6.60 (m, 2H) ppm. The mixture was filtered through Celite the organic solution washed three times with saturated aqueous sodium bicarbonate solution The aqueous layers were washed with ether the combined organic layers dried (MgSO4) filtered partially concentrated by evaporation The volatile product was obtained as a mixture with ether

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

Procedure: Following the procedure of Intermediate 106, replacing 1-(3,5-difluorophenyl)ethanol with 1,3-difluoro-5-methylbenzene, and reducing the number of equivalents of butyl lithium to 1.05 provided the title compound.

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: The title compound was prepared from 1-bromomethyl-2,3,5-trifluoro-benzene by a procedure analogous to that for 3,5-difluorotoluene, above. 1H NMR (400 MHz, CDCl3) δ ppm; MS (APCI, m/z): [M+H]+.