3-bromo-5-methoxybenzaldehyde

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:

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: Alkylation of 3-bromo-5-methoxybenzaldehyde with acetonitrile following the method used in Example 115 gave 3-(3-bromo-5-methoxyphenyl)-3-hydroxypropanenitrile as a pale yellow oil. Yield (4.1 g, 70%): 1H NMR (400 MHz, DMSO-d6) δ 7.16-7.15 (m, 1H), 7.04-7.03 (m, 1H), 6.97-6.96 (m, 1H), 6.04 (d, J=4.8 Hz, 1H), 4.87-4.83 (m, 1H), 3.74 (s, 3H), 2.89 (ABd, J=16.4, 5.2 Hz, 1H), 2.81 (ABd, J=16.8, 6.8 Hz, 1H).

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

Procedure: Alkylation of 3-bromo-5-methoxybenzaldehyde with acetonitrile following the method used in Example 115 gave 3-(3-bromo-5-methoxyphenyl)-3-hydroxypropanenitrile as a pale yellow oil. Yield (4.1 g, 70%): 1H NMR (400 MHz, DMSO-d6) δ 7.16-7.15 (m, 1H), 7.04-7.03 (m, 1H), 6.97-6.96 (m, 1H), 6.04 (d, J=4.8 Hz, 1H), 4.87-4.83 (m, 1H), 3.74 (s, 3H), 2.89 (ABd, J=16.4, 5.2 Hz, 1H), 2.81 (ABd, J=16.8, 6.8 Hz, 1H).

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

Procedure: 3-Bromo-5-methoxybenzaldehyde (1 g, 4.65 mmol) was dissolved in 20 mL dichloromethane. A solution of boron tribromide (1M in dichloromethane, 23 ml, 23 mmol) was added dropwise and the reaction was stirred at room temperature overnight. The mixture was diluted with ethyl acetate and washed with a solution of 4% sodium bicarbonate, water, brine and dried over sodium sulphate, filtered and evaporated under reduced pressure. A mixture of ethyl ether and diisopropyl ether was added and the precipitate was filtered to give 1.1 g (68% yield) of the title compound as an orange solid. Purity 99%. washed with a solution of 4% sodium bicarbonate, water, brine dried over sodium sulphate filtered evaporated under reduced pressure A mixture of ethyl ether and diisopropyl ether was added the precipitate was filtered

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

Procedure: A solution of 3-bromo-5-methoxybenzaldehyde (3.93 g, 18.2 mmol), propane-1,3-diol (1.6 mL, 21.8 mmol) and p-toluenesulfonic acid monohydrate (0.104 g, 0.54 mmol) in anhydrous toluene (100 mL) was brought to reflux for 18 h under nitrogen. During this time water was removed using a Dean-Stark apparatus. After this time the reaction was cooled to rt, washed with 5% aqueous Na2CO3 solution (50 mL) and dried over anhydrous Na2SO4. The reaction was concentrated under reduced pressure to give 2-(3-bromo-5-methoxyphenyl)-1,3-dioxane (4.80 g, 96%) as a brown oil. to reflux for 18 h under nitrogen During this time water was removed washed with 5% aqueous Na2CO3 solution (50 mL) dried over anhydrous Na2SO4 The reaction was concentrated under reduced pressure

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

Procedure: A solution of 1,3-dibromo-5-methoxybenzene (5.00 g, 18.8 mmol) in anhydrous diethyl ether (100 mL) was cooled to −78° C. Then a solution of n-butyllithium in hexanes (2.5 M, 8.3 mL, 20.68 mmol) was added drop-wise at −78° C. under nitrogen. After the addition was complete, the reaction was stirred at −78° C. for 45 min. After that time, anhydrous DMF (7.3 mL), 94.0 mmol) was added, the cooling bath was removed and the reaction mixture was allowed to warm to rt. The reaction was diluted with saturated aqueous NH4Cl solution (100 mL) and diethyl ether (100 mL). The organic phase was separated, washed with water, dried over anhydrous Na2SO4 and concentrated under reduced pressure to give 3-bromo-5-methoxybenzaldehyde (3.95 g, 98%) as yellow oil: 1H NMR (400 MHz, CDCl3) δ 9.90 (s, 1H), 7.57-7.60 (m, 1H), 7.31-7.33 (m, 2H), 3.86 (s, 3H). After the addition the cooling bath was removed to warm to rt The reaction was diluted with saturated aqueous NH4Cl solution (100 mL) and diethyl ether (100 mL) The organic phase was separated washed with water dried over anhydrous Na2SO4 concentrated under reduced pressure

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

Procedure: A solution of 1,3-dibromo-5-methoxybenzene (5.00 g, 18.8 mmol) in anhydrous diethyl ether (100 mL) was cooled to −78° C. Then a solution of n-butyllithium in hexanes (2.5 M, 8.3 mL, 20.68 mmol) was added drop-wise at −78° C. under nitrogen. After the addition was complete, the reaction was stirred at −78° C. for 45 min. After that time, anhydrous DMF (7.3 mL), 94.0 mmol) was added, the cooling bath was removed and the reaction mixture was allowed to warm to rt. The reaction was diluted with saturated aqueous NH4Cl solution (100 mL) and diethyl ether (100 mL). The organic phase was separated, washed with water, dried over anhydrous Na2SO4 and concentrated under reduced pressure to give 3-bromo-5-methoxybenzaldehyde (3.95 g, 98%) as yellow oil: 1H NMR (400 MHz, CDCl3) δ 9.90 (s, 1H), 7.57-7.60 (m, 1H), 7.31-7.33 (m, 2H), 3.86 (s, 3H). After the addition the cooling bath was removed to warm to rt The reaction was diluted with saturated aqueous NH4Cl solution (100 mL) and diethyl ether (100 mL) The organic phase was separated washed with water dried over anhydrous Na2SO4 concentrated under reduced pressure